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Hatari
Chrome-Tanned Leather: Schultz's Two-Bath Process, 1884
A cleaned hide soaked in potassium dichromate, then in sodium thiosulfate with a little hydrochloric acid, turns into soft, strong chrome leather: the second bath turns the chromium inside the skin into the salt that tans it (Schultz, US 291,784, 1884). A thin skin takes about 15 minutes in each bath, a full skin about an hour.
The picture: our drawing of the two baths.
Kati
A day
Maudhui hatari
Blueprint hii ina taratibu za hatari. Ingia na uwashe maudhui ya hatari katika mipangilio ya akaunti yako ili kuona maagizo ya hatua kwa hatua.
IngiaMchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.