| OCR Text |
Show , Hydrogen Peroxide. Many years ago It was discovered that hydrogen peroxide slowly dissolves dis-solves out of the reduced silver and the gelatin substratum of a photographic photo-graphic plate, and thus leaves a re- lief image with the denser portions ; sunk and the parts least affected pho-' pho-' tographically raised. The process has - been quickened, so as to be completed in a few minutes, by adding a little acetic acid to the peroxide bath or U-..IM i . i r i - i 1 d s , 11 o u 1) p t: ,IN . o"TBl.l iiuiusuiplute, and the variations of shade are represented by varying thicknesses of unattacked silver sil-ver gelatinobromide. This positive image im-age is given any desired tint by being made to absorb aniline colors. The thick parts of the image take up considerable con-siderable color, and the thin parts proportionately pro-portionately less. Prints may be obtained ob-tained from simple contact with the colored positive while damp, one soaking soak-ing in the color hath yielding two or three Impressions. |
