Читать книгу Henley's Formulas, Recipes and Processes (Applied Chemistry) - Various - Страница 541
Feathers.
Оглавление—Place the feathers from 3 to 4 hours in a tepid dilute solution of bichromate of potassa, to which, cautiously, some nitric acid has been added (a small quantity only). To remove a greenish hue induced by this solution, place them in a dilute solution of sulphuric acid, in water, whereby the feathers become perfectly white and bleached.
