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Lead Acetate Cotton
铅绵之制
古有以铅绵为验气之物者。其法，取铅之醋酸盐，制为绵状，是为铅绵。
每欲验气中有无硫类之物，置铅绵于气中。若气含硫，铅绵色变。盖硫与铅之醋酸盐相化合，生黑色之硫化铅，遂见铅绵由白转黯。
凡验气之场所，如矿穴、冶坊，或有气泄漏之处，皆可用铅绵试之。察铅绵之色变，便知气之纯净与否。此铅绵虽小物，然于验气一道，功用颇大，能使人先知气之害，早为防备，以保身安业顺也。
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+8615371019725
Yana Yang
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