Colloidal Sulfur

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Sulfur, Colloidal

 

a grayish yellow powder containing 70–90 percent finely dispersed elemental sulfur, 8–25 percent moisture, and a small amount of surface-active agents and filler. Colloidal sulfur is used in plant protection to combat fungal diseases, as well as harmful herbivorous mites and ticks.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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* Antiseborrheic & Antidandruff Medicated Shampoo for Dogs and Cats, featuring zinc pyrinthione, salicylic acid and colloidal sulfur for the treatment of seborrheic dermatitis.
No cause of the acidification was found, but when I added hydrochloric acid to a sample, release of colloidal sulfur showed that the acidification was caused by thiosalts formed by oxidation of pyrite in the mine's concentrator, and the rest is history.
The conversion of cyanide to thiocyanate occurs by means of the specific enzyme rhodanase (which catalyses the formation of thiocyanate from cyanide in the presence of sodium thiosulfate or colloidal sulfur) (Martensson and Sorbo, 1978; Frankenberg, 1980).