We think that Mr Wang’s reasoning is also open to criticism. First, in all the above materials, Li Tong mirror changbian continued funding of the treatment is the most original material, considered. Is the book begins in the period of Emperor Gaozong of Song, finish on filial piety in the Song dynasty period, but bile copper production by that time were already in production occupies an important position in the copper industry. If the period of Emperor Renzong of Song officials were ignorant of biliary copper description is wrong, it is also understandable that; but if the people of Southern Song Li Tong does not know what is biliary copper Board book for persistent “copper cast iron hybrid” means without textual clearly unreasonable. Although the existing mirror changbian continued funding of the treatment and copper recorded no bile in the content, but this fact does not prove that Li Tong on biliary copper does not understand. Government began vigorously implementation bile copper method production is in Song Zhe Zong Shaosheng years and Emperor Huizong were ruled period, and existing of continued funded treatment pass mirror changbian under precisely missing zhezongyuan y result u@ ① eight years (1093) July to Szabo Saint four years (1097) March of content and emblem were, and Chin were two towards of all content, cause we cannot from existing of continued funded treatment pass mirror changbian under in the see about bile copper production of recorded. However, in the group book Causo Zhang Ruyu refers to a now lost missing mirror changbian continued funding of the governance of the content, which explicitly mention the gall of copper. Citation following: “(Sung Ning five years zhongshusheng prospecting will all road revenue copper number) annual about received all color copper more than 6.6 million kg, old copper Tin about received more than 4.6 million kg, bile copper about received 1 million kg sth sth” immediately subsequently of a article material is from are has lost lost of continued funded treatment pass mirror changbian under content, material records has Kaifeng yin and lifting Kyung Ki money prison Song Qiaonian in Grand II years of Shang statements, which more is repeatedly mentioned “seep through copper coins (with bile copper casting of money)”, because bile copper cast money cost low, Song Qiaonian also recommendations: “hubu available of number, can seep through copper coins Xia all road order yiyangzhu. “[17] (set volume 60 after the fiscal deficit · coins class) you can tell from these records, Li Tong’s original book was a new species of biliary copper, bile of copper and copper he should know the difference. Based on this, should not be “copper-iron complex casting” as “error” of the genus. Second, the casting of main raw materials are copper coins in the Song dynasty, auxiliary materials are lead and Tin, copper coins of the Northern Song dynasty maintained a basically “is their agent, six copper, lead, Tin Sam, there are odd win” proportion of materials. During the Southern Song emperor Huizong later to owing to lack of copper copper ore, and mass production biliary copper, cast copper money raw material also used in biliary copper. The full text of the Song Shi said “true copper-third and to the” the implication is that reflects the people still have the traditional concept at that time, only after mining of copper smelting are recognized is “copper”, also reflects the number of mine copper only three-tenths per cent of all copper raw materials used for money. This figure and the continued funding of Hueschen in the treatment of mirror changbian money formula only coincidences on the proportion of cases only, connotation is different. Hueschen says “copper two-iron six minutes”, not mine copper and biliary copper ratio, but rather to change the proportion of raw material and cast copper coins, will remove lead and Tin, adding the iron as the main raw material, six-tenths per cent of all cases, strong copper accessories, top three-tenths per cent of all cases. Third, the mirror changbian continued funding treatment referred to in “medicine mixed cast iron and copper” was intended also to understand it from another angle. Due to the end of the melting point of high melting point of iron, copper, put together two kinds of raw materials to melt, inevitable copper melting of iron is not out of sync, Hueschen said in the proposal of “medicine” is probably in order to address this issue and joined some flux to lower the melting point of iron. However, this formulation is fundamentally unworkable plots for iron, copper, were naturally occurring during the test, “miscellaneous iron stream astringent and not the” problem. In addition, limited by production conditions at that time, biliary copper production should be in the tank water (or gall) abundant in the mining area, and continued funding of the treatment of mirror changbian just mentioned in Jingshi Xu Shenchu, money directly in Jiangzhou after testing. These two places is only money sites, does not produce biliary copper, if Hueschen materials for biliary copper were used as money, rulers must first biliary copper in some production out of the mine, then transported to the metropolitan or Jiangzhou money, but for such an important production activity, North but made no mention in the records of the period of Emperor Renzong of Song. Given the above analysis of several points, I think the period of Emperor Renzong of Song Hueschen in the metropolitan and Jiangzhou money test should be used as raw materials for iron and copper, and bear no relation to bile production.
Third, the period of Emperor Zhezong of Song by biliary copper promotion
According to Su zhe the Longchuan records contained, songzhezongyuan y result u@ ① period, I wish there is a businessman, to give the Government a secret law – biliary copper law. At that time, Su zhe hubu Assistant Minister, “a businessman in hubu, a secret method to iron for copper copper sulfate. (Su zhe) called closely question saying: ‘ banned by ru, secret law. Try this if is to the Crown, must be broad, Yu Man cannot, will bring others to help you, you all know, non-complex secret, effect of the ban, this will be all over the world. And my Palm Court plans first to row by indiscriminate mess, I don’t. ‘ @ ② f ǔ @ black out its people, that call on provincial words, everybody confused, try chopping the Sabre, and thereafter was accomplished. “[18] (volume five not heard b ì @ ④ method can to iron for copper who under) Su point any hubu Assistant Minister of time is in Yuan y result u@ ① II years (1087) November to Yuan y result u@ ① four years (1089) June [11] (volume 407 Yuan y result u@ ① November 2 methyl Xu; volume 429 Yuan y result u@ ① June 4 Ding not), visible this segment period song Government of rulers still not understanding bile copper production and by can up to of role, bile copper production also was called” secret method “, still is civil privately for of small range production.
Biliary copper no longer be promoted as a secret law banned by the Government, is in raozhou Dexing County man Zhang Qian, Zhang Jia wrote of the leaching of copper slightly to the father and son Song Zhe Zong Shaosheng years after the Imperial Court. Author of on the leaching of copper slightly and writing times, people and Zhao Bo Chen Zhensun of the Southern Song dynasty recorded in much the same. Chen Zhensun of the Zhai stated in solving index containing such data as the editions, illustrations, commentaries and sources of a certain book or certain publications: “the copper slightly immersed volume, Zhang Jia, called ‘ grassy marsh of dexing ‘. Shao shengyuannian (1094) sequence, cover flooding bile Tetsushige beginning of copper. A, progenitor of the politics of public. “[19] (volume 14, of the hybrid arts class) Zhao Bo in the outline of the interception games record of telling about the Xinzhou qianshanxian introduced in Shao during the Saint Gall when copper production scenarios mentioned: [20] (volume five of the interception outline of games in mind)
Lead (qianshanxian) of fukang, treasure Hing yan; lead fountain of baohuo here. Sometimes, of infinite. Fang Quan-Mongolian, which is known by its power, Pouilly Zhang Jia, cable, and Huan method creates to adjuvant. Song Shao, of all the managers. D ī @ ⑤ springs pool, soothing pools to ditch, cloth and iron, to saturate, iron and copper into sth These two materials are simply pointed out that Zhang Jia bile test of copper to the Imperial Court and offered books and persons, thereby missing the merits of the father of Zhang Jia Zhang Qian. In fact, during a test in biliary copper production by, Zhang Qian’s merits is maximum. Wang Xiangzhi in the territory of Sheng JI Chu Xiaoxi of the Changsha records are referenced in (Note: for the Changsha Chu Xiaoxi 11 volumes of the journal, see volume 204 of the art of the Song Shi of the three. ) Record, saying: “long Sha Zhiyun: ‘ start, iron for copper raozhou Zhang Qian of the wonderful, to mail call on Jue Xianzhi. Imperial Court before its method in Qianshan, and Rao of rainwater in puddles of Hing Lee, Shao (Shum) of water are submerged method. ‘ “[21] (volume two or three of the South East · raozhou · under scene) a few years ago, dexing, Jiangxi province discovered the tomb of Zhang Qian line-shaped tablet, the inscriptions in the first year of Grand view of Northern Song dynasty (1107) in March, the inscription reads: Zhang Qian” reading of the Shen Nong tasted book of iron for copper water leaching of copper sulfate, try xinran. The saying: ‘ this also benefits the operation ‘. Life offers its mail. “(Note: it is reported that the inscriptions more than 3,000 characters. This tablet is saved in Dexing County Museum. ) [22] this inscription shows, the Shennong Bencao Jing, Zhang Qian from down in the record book gain awareness of biliary copper, after their test written in the book of leaching copper slightly, asked his son Zhang Jia turned over the Imperial Court, biliary copper to after this promotion.
Addition to the above song recorded outside, of the late Yuan and early Ming human crisis article wrote of the leaching of copper slightly sequence, introduced the Song dynasty who wrote the book of the leaching of copper slightly and Dexing County leaching copper, most detailed content. He wrote:
(Yuan dynasty) Division for dexing in Fujian vision comfort, adjustable Crown Metropolitan examination full, more coins by the national party, offered precedent of the leaching of copper slightly in the DPRK. …… Trip to coins, so the drums cast of infinity, copper production is limited. Acting is the leaching of iron, copper, and Gong Bo received less cost. …… In Shao this book, and its assertion that, covers y result $ u@ â ‘ first year. Or statements take bile Springs dip iron, take mine cooking copper, its springs 30 has II: 5th at wash who a, said cattle; 7th at wash who ten has four, said yongfeng, and Castle Peak, and Huangshan, and large rock, and cross Springs, and stone wall w ù @ ⑥, and align official w ù @ ⑥, and small Nanshan, and Zhang Muyuan, and East Shannan-sur-, and shangdongshan, and Xia Dongshan, and Shang Shi Gu, and Xia Shi Gu; 10th at wash who ten has seven, said West Jiao Yuan, and copper fine, and dashangshan, and cross chashan, and cross, shicha Rd w ù @ ⑥, and sheep stack, and neutron m his n@ ⑦, and cold dip, and cross, shicha Rd Xia w ù @ ⑥, and Chen Jun, and furnace Qian, and Shang Yao m his n@ ⑦, and Xia Yao m his n@ ⑦, and Shang carbon focal, and Xia carbon focal, and shanghemu, and in the He Mu, and Xia He Mu. Where to channel baisanshi have eight. And the spill of more than five years of rain spring, the dip to the maximum. Is the book, first presented little acting Grand name down the House, to delegate his daughter donated Grand name strips, a surname Fu cheng Zhong Fu King name. Sun Assistant Administrator of a surname Zhong Gong Huidao sh his @ ⑧ sequence records. (Note: text errors in the original text, and the Jiangxi General Annals Volume 162 introduction recorded in the Miscellanies repair dangerous effect on the leaching of copper slightly sequence of corrections. ) [15] (volume three of the leaching of copper slightly sequence)
Judging from the dangerous effects of the genus, he saw the leaching of copper slightly in this book contains a sequence of Zhang Qian’s great-grandson Zhang Dao, showing that this book has offered is not Zhang Qian Shao shengyuannian version of the Imperial Court. Family origins of Zhang Dao and Zhou wenzhong set will be an official career [23] (mid-left a Temple University Senior Minister volume 64 of the doctor’s Assistant Administrator presented a surname of Zhang Zhongding Gong Dao tombstone), and the Song Shi, [14] (volume 382 of the Zhang Dao) are recorded: “Zhang family of dexing, after Prime Minister Tang @ ¢á … Public (Zhang Dao) great-grandparents name intermediate pass straight by Shi Lang, presented Prince Edward little …. Zu Pan, Yuanzhou wanzai County main book, presented Prince Edward a surname … Gong Huidao, sth Governance and for eight years (1118) tingshi sth Son of an affinity for RTHK’s third. “One of the Zhang Dao Yu Hui and Chin high, filial piety, and dynasties, in the first year of Longxing (1163) moved to Assistant Administrator, to old disease do not worship, chapter remonstrations, Bachelor of science in addition to the House of the Senior Minister, lifting concept of longevity and Chamberlain read. After Shi. Stroke two years on dry road (1165), year 75, IK Chung. Based on the life of Zhang Dao to judgment, Zhang Dao as the leaching of copper slightly preface should, after he entered the career of the late Northern Song dynasty to the Southern Song dynasty between the early years of the dry road. Dangerous effects in the leaching of copper slightly sequence mentioned in the “spring two 30″ name and “and the spill of more than five years of rain spring, the dip to the maximum” sentence, likely came from Zhang Dao as the leaching of copper made slightly more content in the sequence. If so, 138 32 spring groove of bile dipped iron scale might not just the spring stage of Northern Song dynasty (Note: the Japan zhongdaomin, although not to research, but mention 138 32 spring gully Dexing County Herald the most prosperous period (late Northern Song dynasty). See what China た の evolution る wet your copper, Toyo Journal Volume 27 3rd, 1939. ), Also extend to the Southern Song dynasty, but raozhou biliary copper output to Song Weizong governance and five years as the highest.
Tetsushige of copper sulfate of copper records have existed since ancient times, North of Emperor Renzong of Song period had also conducted an experiment, why only to the period of Emperor Zhezong of Song popularized it? This is the objective needs of the situation, and Zhang Qian also is closely related to the efforts of father and son. The early Song dynasty, while the copper mining was gradually rising trend, copper supply and demand contradiction is not sharp; on the other hand, the Government has long taken a “copper-ban” measures, I am afraid that new production technology to circulate, on Government monetary policy difficult to control the situation; Furthermore, biliary copper production theory is still in trial stages. During this period, both objective factors, are subjective factors, also do not provide a basis for bile produced by copper. When Emperor Zhezong of Song succeed to the throne, has faced a copper production ended during the reign of brilliant development stage and entered a period of sharp decline, this situation resulted in a large quantity of money supervision of sharp reduction of waste and the amount of money. Song dynasty Government under enormous pressure, urgently ways to recover copper production, increasing production. It is in this situation, Zhang Qian after father and son of painstaking tests, systematically summarized bile production methods, and dedicated to the Imperial Court of the leaching of copper slightly more proactively. Demand for objective and subjective efforts to get the perfect combination. Thus, in the song and strong advocate of the Government, bile produced by copper rapidly by promotion.
论宋代的胆铜生产 B
我认为汪先生的推论还是有值得推敲的地方。其一，所有上述材料中，李焘的《续资治通鉴长编》是最为原始的材料，可信度最高。是书始撰于宋高宗时期，完成于宋孝宗时期，而那个时期胆铜法生产早已在铜业生产中占据了重要的位置。如果说宋仁宗时期的官员因不了解胆铜而记述有误，这还是可以理解的；但是如果南宋人李焘也不知胆铜为何物而在编书时对屡次出现的“铜铁杂铸”之意不加考辨，显然就不合情理了。虽然现存《续资治通鉴长编》内容中并无胆铜记载，但是这一情况并不能证明李焘对胆铜不了解。政府开始大力推行胆铜法生产是在宋哲宗绍圣年间以及宋徽宗统治时期，而现存的《续资治通鉴长编》恰恰缺失哲宗元ｙòｕ＠①八年（1093年）七月至绍圣四年（1097年）三月的内容以及徽宗、钦宗两朝的全部内容，致使我们无法从现存的《续资治通鉴长编》中看到有关胆铜生产的记载。然而，章如愚的《群书考索》中引用了一条现已佚失的《续资治通鉴长编》内容，其中就明确提到了胆铜。引文如下：“（崇宁五年中书省勘会诸路岁收铜数）每年约收诸色铜六百六十余万斤，旧铜锡约收四百六十余万斤，胆铜约收一百万斤……”紧接其后的一条材料也是引自现已佚失的《续资治通鉴长编》内容，材料记录了开封尹兼提举京畿钱监宋乔年在大观二年的上言，其中更是多次提到“漉铜钱（用胆铜铸造的钱）”，由于胆铜铸钱成本低，宋乔年还建议：“户部上供之数，可以漉铜钱下诸路令依样铸。”［17］（后集卷六○《财用门•铜钱类》）从这些记载中可以得知，李焘的原书是记述过胆铜的，他对胆铜与矿铜的区别应该有所了解。基于此，似不应将“铜铁杂铸”等内容视为“失误”的记述。其二，宋代铸造铜钱的主要原料是铜，辅料是铅和锡，北宋的铜钱基本上保持了“十分其剂，铜居六分，铅、锡居三分，皆有奇赢”的用料比例。宋徽宗以后至南宋期间因缺少矿铜铜料，又已批量生产出胆铜，所以铸钱的铜原料中同时也使用了胆铜。《宋史全文》所说的“和以三分真铜”之意，既反映了当时人们仍抱有传统的观念，只承认经过采矿冶炼得到的铜才是“真铜”，同时也反映了矿铜数量只占铸钱所用全部铜原料的十分之三。这一数字与《续资治通鉴长编》中许申的铸钱配方只是在料例的比例上巧合而已，内涵则是不同的。许申所说的“铜居三分，铁居六分”，并不是指矿铜和胆铜的比例，而是指要变更铸造铜钱的原料和比例，将铅和锡去掉，加入铁作为主要原料，占全部料例的十分之六强；此时铜成为辅料，仅占全部料例的十分之三强。其三，《续资治通鉴长编》中提到的“以药化铁与铜杂铸”之意，亦可以从另一个角度来理解。由于铁的熔点高、铜的熔点底，把两种原料放到一起来熔化，必然产生铜先熔化而铁未化的不同步现象，许申的建议中所说的“药”很可能就是指为了解决这一问题而加入的某些助熔剂，以降低铁的熔点。然而，这种别出心裁的铁、铜配方是根本行不通的，试验过程中自然出现了“杂以铁则流涩而多不就”的问题。另外，受当时生产条件的限制，生产胆铜应该是在胆水（或胆土）充沛的矿区中进行，而《续资治通鉴长编》只是提到许申初在京师、后在江州直接进行铸钱试验。这两个地方仅是铸钱场所，并不生产胆铜，如果许申使用了胆铜作为铸钱材料，官府必定要先在某些矿场生产出胆铜，再运至京师或江州铸钱，但是对于这样重要的生产活动，北宋仁宗时期的各类记载中却只字未提。鉴于以上几点分析，我认为宋仁宗时期许申在京师和江州进行的铸钱试验应该是用铁和铜作原料而进行的，与胆铜生产并无关系。
三、宋哲宗时期胆铜法开始推广
据苏辙《龙川略志》载，宋哲宗元ｙòｕ＠①时期，有一位商人毛遂自荐，向政府献出秘法——胆铜法。当时，苏辙任户部侍郎，“有商人自言于户部，有秘法能以胆矾点铁为铜者。予（指苏辙）召而诘之曰：‘法所禁而汝能之，诚秘法也。今若试之于官，则所为必广，汝一人而不能自了，必使他人助汝，则人人知之，非复秘也，昔之所禁，今将遍行天下。且吾掌朝廷大计，而首以行滥乱法，吾不为也。’其人＠②ｆǔ＠③而出，即诣都省言之，诸公惑之，令试斩马刀，厥后竟不成。”［18］（卷五《不听ｂì＠④法能以铁为铜者》）苏辙任户部侍郎的时间是在元ｙòｕ＠①二年（1087年）十一月至元ｙòｕ＠①四年（1089年）六月［11］（卷四○七元ｙòｕ＠①二年十一月甲戌；卷四二九元ｙòｕ＠①四年六月丁未），可见这段时期宋政府的执政者仍然不了解胆铜生产及其所能起到的作用，胆铜生产还被称为“秘法”，仍旧是民间私下进行的小范围生产。
胆铜法不再作为政府所禁的秘法而得到推广，是在饶州德兴县人张潜、张甲父子将撰写的《浸铜要略》献给朝廷之后的宋哲宗绍圣年间。关于《浸铜要略》的作者及成书年代，南宋人陈振孙和赵蕃的记载大致相同。陈振孙在《直斋书录解题》中指出：“《浸铜要略》一卷，张甲撰，称‘德兴草泽’。绍圣元年（1094年）序，盖胆水浸铁成铜之始。甲，参政子公之祖。”［19］（卷一四《杂艺类》）赵蕃在《截留纲运记》一文中追述信州铅山县在绍圣年间推行胆铜生产的情景时也提到：［20］（卷五《截留纲运记》）
铅（指铅山县）之阜，宝藏兴焉；铅之泉，宝货化焉。兴者有时，化者无穷。方泉之蒙，孰知其功，布衣张甲，体物索理，献言以佐圜法。宋绍圣间，诏经理之。ｄī＠⑤泉为池，疏池为沟，布铁其中，期以浃旬，铁化为铜……这两条材料都仅仅指出张甲是胆铜的试验者和向朝廷献书者，从而遗漏了张甲之父张潜的功绩。实际上，在胆铜法生产的试验过程中，张潜的功劳是最大的。王象之在《舆地纪胜》中引用了褚孝锡的《长沙志》（注：褚孝锡作《长沙志》十一卷，见《宋史》卷二○四《艺文三》。）记载，曰：“长沙志云：‘始，饶州张潜得变铁为铜之妙，使其子甲诣阙献之。朝廷始行其法于铅山，及饶之兴利、韶之涔（岑）水皆潜法也。’”［21］（卷二三《江南东路•饶州•景物下》）前几年，江西德兴发现了张潜的墓行状碑，碑刻于北宋大观元年（1107年）三月，碑文记载：张潜“尝读《神农书》，见胆矾水可浸铁为铜，试之信然。曰：‘此利国术也’。命其子甲献之。”（注：据报道，碑文三千多字。此碑保存在德兴县博物馆。）［22］这段碑文说明，张潜从流传下来的《神农本草经》一书的记载中获得对胆铜法的认识，经过自己的试验后写成《浸铜要略》一书，嘱其子张甲上交朝廷，这之后胆铜法才得以推广开来。
除以上宋人记载外，元末明初人危素写有《浸铜要略序》一文，介绍了宋代《浸铜要略》一书的撰写者及德兴县浸铜情况，内容最为详尽。他写道：
（元代）德兴张理从事福建宣慰司，考满调官京师，会国家方更钱币之法，献其先世《浸铜要略》于朝。……钱币之行尚矣，然鼓铸之无穷，产铜则有限。理之术乃能浸铁以为铜，用费少而收功博。……今书作于绍圣间，而其说始备，盖元ｙòｕ＠①元年。或言取胆泉浸铁，取矿烹铜，其泉三十有二：五日一举洗者一，曰黄牛；七日一举洗者十有四，曰永丰、青山、黄山、大岩、横泉、石墙ｗù＠⑥、齐官ｗù＠⑥、小南山、章木原、东山南畔、上东山、下东山、上石姑、下石姑；十日一举洗者十有七，曰西焦原、铜精、大尚山、横槎山、横槎ｗù＠⑥、羊栈、陲ｍíｎ＠⑦、冷浸、横槎下ｗù＠⑥、陈君、炉前、上姚ｍíｎ＠⑦、下姚ｍíｎ＠⑦、上炭灶、下炭灶、上何木、中何木、下何木。凡为沟百三十有八。政和五年雨多泉溢，所浸为最多。是书，理之先赠少保府君讳潜所撰，以授其子赠少师府君讳盘、成忠府君讳甲。少师之孙参知政事忠定公讳焘ｓｈí＠⑧序志之。（注：原文中有文字错误，已与《江西通志》卷一六二《杂记补》中引录的危素《浸铜要略序》对校改正。）［15］（卷三《浸铜要略序》）
从危素的记述来看，他见到的《浸铜要略》这部书中载有张潜的曾孙张焘作的序，可见此书已不是张潜绍圣元年献呈朝廷的版本。张焘的家世渊源及仕宦生涯在周必大的《文忠集》［23］（卷六四《资政殿大学士左中大夫参知政事赠太师张忠定公焘神道碑》）和《宋史》［14］（卷三八二《张焘传》）中均有记载：“张氏世家德兴，唐宰相文＠⑨之后……。公（张焘）曾祖讳潜，通直郎致仕，赠太子少保……。祖磐，袁州万载县主簿，赠太子少师……。公讳焘，……政和八年（1118年）廷试……天子嘉之，亲擢第三。”张焘任官于徽、钦、高、孝四朝，于隆兴元年（1163年）迁参知政事，以老病不拜，台谏交章留之，除资政殿大学士、提举万寿观兼侍读。后致仕。卒于乾道二年（1165年），年七十五，谥忠定。根据张焘的生平来判断，张焘为《浸铜要略》作序，应在他进入仕途之后的北宋末期至南宋乾道初年之间。危素在《浸铜要略序》中提到的“其泉三十有二”的名称及“政和五年雨多泉溢，所浸为最多”之句，有可能出自张焘为《浸铜要略》所作序中的内容。若果如此，三十二泉一百三十八沟的胆泉浸铁规模可能就不仅仅是北宋末期的情况（注：日本中岛敏先生虽未考证，但是提到三十二泉一百三十八沟是德兴县兴利场最盛时期（北宋末期）的事。见《支那た於什る湿式收铜の沿革》，东洋学报27卷第3号，1939年。），还延续到了南宋，但饶州的胆铜生产量则以宋微宗政和五年为最高。
胆矾化铁成铜的记载古已有之，北宋仁宗时期还曾进行过试验，为什么偏偏到宋哲宗时期才得到推广呢？这既是客观局势的需要，也与张潜父子的努力密切相关。北宋前期，一方面，铜矿的开采量呈逐步上升的势态，铜料供与需的矛盾尚不尖锐；另一方面，政府长期以来采取着“铜禁”措施，恐怕新的生产技术普及流传开来，会对政府的货币政策造成难以掌控的局面；加之，胆铜的规模化生产理论还处在摸索阶段。这一时期，无论是客观因素，还是主观因素，都还没有提供胆铜法生产的基础。而宋哲宗嗣位时，却面临着铜矿生产结束了宋神宗时期辉煌发展的阶段而进入急剧衰落的时期，这种局面导致了大批铸钱监的罢废和铸钱额的剧减。宋政府面临着巨大的压力，急需采取各种办法恢复铜矿生产，提高产量。正是在这种局势下，张潜父子经过潜心试验，系统地总结出胆铜生产的方法，并主动将《浸铜要略》献给朝廷。客观需求与主观努力得到了完美的结合。于是，在宋政府的大力提倡下，胆铜法生产迅速地被推广开来。
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