sodium hyposulfite การใช้

• It is also called sodium hyposulfite or  hypo.
• According to Austrian chemist Josef Maria Eder, Daguerre was not versed in chemistry and it was Dumas who suggested Daguerre use sodium hyposulfite, discovered by Herschel in 1819, as a fixer to dissolve the unexposed silver salts.
• Highly theatrical and dramatically lit, her pictures are frozen stage sets, still-life psychodramas in which she cast eminent friends like poet Alfred Tennyson; historian Thomas Carlyle; and scientist J . F . W . Herschel, the Dr . Who look-alike who boosted photography by discovering a powerful fixing agent, sodium hyposulfite.