TALBOT4277

Sir J. Herschel Bar^t

June 12. 1841

31 Sackville S^t London ¹

Dear Sir,

I send the Literary Gazette ² of today, containing a short account of my paper on Calotype, read last Thursday. ³

I enclose a sheet of the paper covered with iodide of silver. This is to be washed with a solution A + B.

[illegible deletion] A. is a solution of 100 grains cryst^d Nitrate Silver in 2 ounces dist^d water, to which is added ⅓ ounce of strong acetic acid but not so strong as aromatic vinegar –

B. is a saturated solution of gallic acid (which I enclose a sample of) in cold distilled water.

A and B are to be mixed in small quantities at a time, and in equal volumes.

By moistening the paper with the liquid, & exposing it for a second to daylight; it will be easily seen that the impression continues to come out spontaneously after the cessation of the exciting cause.

Yours very truly
H. F. Talbot

I return the Pink Lady enclosed. ⁴