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Lead Acetate Paper H2s
《论验硫之法》
世有验硫之方，常以醋酸铅试纸与硫化氢相验。醋酸铅试纸者，素纸浸于醋酸铅溶液，而后晾干成之。
硫化氢者，气臭如腐卵，性毒。当其遇醋酸铅试纸，即起化应。硫化氢中硫离子与醋酸铅中铅离子合，生硫化铅。硫化铅色黑，故见试纸色转黑，则知有硫化氢存焉。
验时，务谨。设硫化氢多，为防中毒，当于通处行之。且醋酸铅试纸宜新制，久置则效减。此验硫之法，于工、学诸事皆为要，可断硫化氢之有无，以避危、明质也。
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