However, it was the production of sodium and potassium bichromate that made Potter's a world leader and by about 1900 the firm had become a limited company.
2.
The gelatinous emulsion is applied to a paper backing, and is rendered sensitive to light when immersed in a 3 : 4 % solution of potassium bichromate.
3.
This latter name came from the practice of producing the chromic acid by adding sulphuric acid to potassium bichromate ( the old name for potassium dichromate ), even though the cell itself contained no bichromate.
4.
Ushkov discovered that the raw materials for potassium bichromate, a chemical used in the dying process was to be found locally, and so he established a plant for its production in the village of Kokshan.
5.
In fact he never disclosed in print that apparently to avoid embarrassment, he made his vaccine by secretly relying on a technique used by a rival, Jean-Joseph Toussaint, a veterinarian, that involved a chemical, potassium bichromate.
6.
After'first development,'the initial silver image is then removed ( e . g . using a potassium bichromate / sulfuric acid bleach, which requires a subsequent " clearing bath " to remove the chromate stain from the film ).
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