Sulfuric acid ([H.sub.2]S[O.sub.4]), silver sulfate ([Ag.sub.2]S[O.sub.4]), Mohr's salts (iron solution and ammonium (N[H.sub.4]) 2Fe (S[O.sub.4]) [sub.2]6[H.sub.2]O),
bichromate of potassium (K2Cr2O7) and ferroin (FeS[O.sub.4], 7[H.sub.2]O) as an indicator dye.
The most common allergens in our study in total on patch testing were potassium
bichromate (30%) and paraben mix (30%), followed by nickel sulphate (21%), epoxy resin (17%) and fragrance mix (17%).
The gum
bichromate process was executed by brushing a coating of gum arabic dissolved in water and then mixed with pigment and a solution of potassium
bichromate onto a sheet of paper.
Imported basic materials are mainly chemicals not yet produced in the country such as soda ash, sodium
bichromate, aluminum hydroxide, sodium sulfate, etc.
Add 1/4 ounce of potassium
bichromate to the goldenrod dye bath.
Chrome dyes: A synthetic dyes that use potassium
bichromate to form a permanent bond between the yarn and the dye.
His association with Stieglitz had such impact, however, that he would promptly abandon his painting studies at the Academie Julian to pursue photography and the new gum
bichromate process, the precursor to colored photography.
Along with Hans Watzek and Hugo Henneberg, he experimented with the Lumiere auto-chrome process, as well as with gum
bichromate printing, in which the contrast of light can be regulated to dissolve the clarity of the image and alter its luminosity.
We all experimented in various ways with the photographic printing technique--gum
bichromate and all began by making sheets of porcelain on which to print.
Several recent books focus on contemporary artists who are reviving historic photographic processes, including Arena Editions' "McDermott & McGough." The book, with text by Mark Alice Durant, documents photographers David McDermott and Peter McGough's explorations of a number of historical photographic processes, including gum
bichromate, cyanotype, platinum palladium and salt printing.
1987) and Al oxide (Aide and Cummings 1997),
bichromate [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is more strongly adsorbed and is the dominant surface species that accounts for much of the increase in adsorption with decreasing pH.