Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 245
tion of pyrogallic acid, but caremust be taken not to add too much. I havealso obtained purple and green proofs, thefirst by adding acetate of lead, the secondwith acetate of lime and ordinary gallicacid. The proofs so executed can be treat-ed as negatives and reproduced by themethods employed to… … N photography, besides thedifficulties of the weather,are those of space, whichremain to be vanquished.Supposing substances pro-digiously sensible are pre-pared by chemists, thereare objects so feeble in their bril-liancy that their impression onthose substances could not beviewed by the eye. If…
Photography · Art and photography
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