Violet-red Definition

Violet-red Sentence Examples

• They are violet-red in colour, and on boiling or long standing with dilute acids they pass into the corresponding roseo-salts.

• In this reaction urea is heated in a dry tube until it gives off ammonia freely; the residue is dissolved in water, made alkaline with caustic soda, and a drop of copper sulphate solution is added, when a fine violet-red coloration is produced.

• It may be detected by the addition of an aqueous solution of potassium cyanide, with which it gives a violet-red coloration, due to the formation of isopurpuric acid.