Henri Raymond Vidal

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Henri Raymond Vidal , (born April 3, 1862 in Agde , † October 30, 1938 in Paris ) was a French chemist, known for the Vidal black.

Vidal studied pharmacy at the University of Montpellier and then worked in pharmacy.

In 1892 he discovered that aminophenols and their precursors turn cotton fabrics black when melted with sodium sulphide and sulfur. In 1893 this was marketed as Vidalschwarz at the Société Matieres Colorantes company in St. Denis . In 1895 he also developed blue and black sulfur-containing dyes based on diphenylamine and its derivatives. In 1899 he separated from the Société Matieres Colorantes. Then Vidal was involved in violent patent disputes with German, Swiss and English companies that developed their own dyes based on his Vidal black (his patents contained loopholes). He was defeated in his patent proceedings (including against the Cassella company ) and his own company founded by him in Koblenz (Deutsche Vidalgesellschaft) was not very successful.

He also dealt with the treatment and cleaning of textiles and most recently with diamond synthesis.

literature

personal data
SURNAME Vidal, Henri Raymond
BRIEF DESCRIPTION French chemist
DATE OF BIRTH April 3, 1862
PLACE OF BIRTH Agde
DATE OF DEATH October 30, 1938
Place of death Paris