Many powders, including sodium chloride and ammonium sulfide
, can harden into a solid block that cannot be dispensed into process liquids without deagglomeration, " said Scott Patterson, ILC Dover vice president of commercial sales.
Ferric sulfide is black, so pouring the ferric chloride solution into a glass treated with ammonium sulfide
resulted in ink.
After 10 minutes, the slides were dipped twice in deionized water, developed in 1% yellow ammonium sulfide
for 1 minute, and then dipped twice again in deionized water.
Ampacet found that many typical pigments turn black when exposed to ammonium sulfide
commonly found in soil.
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