TALBOT3847

27 March 1839 ¹

My dear Sir,

I see in your Letter to Biot ² you say that the Chloride of Silver is washed out. I do not think that the hyposulphite of Soda &c dissolves the chloride, or washes it out

I suspect that hyposulphite is added to chloride in water, it forms a soluble precipitate, of hyposulphite of Silver? (query) which is not acted upon light. At all counts it seems to me that if this mixture is put on paper & left to dry it does not discolour by light & it seems to me that if nitrate of silver is added a fresh precipitate of Chloride is formed.

May not Daguerre’s & Niepce’s ³ be done first on paper & then transferred from the paper on a metal plate

Yours very truly,
J W Lubbock

27 March 1839