Thomas Colby to Faraday   c27 November 1832¹

Ordnance Map Office | Tower.

My dear Sir,

I send you, your knife, a large piece of black to be reduced to pure carbon, a phial of oil ready burned for printing, a saucer of ink ready mixed for printing, old brown impressions, three qualities of printing paper. I have sent these articles under the idea, that it will give you less trouble to put them all under experiment at once, than to have only limited means to make a doubtful experiment. I shall be glad to see the result of your experiment with the c[h]lorine, and feel much obliged by the trouble you have taken in making it[.] As you tell me the ink contains much lime, I send a large piece, and if you give us the pure carbon from it, we may try the effect of it in printing.

Very truly yours | Thos. Colby

Endorsed by Faraday: 1832

Address: Dr. Faraday | Royal Institution | Albemarle Street