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The dye is an organic compound of bromine (i.e., an organobromine compound), a class of compounds often found in algae and in some other sea life, but much more rarely found in the biology of land animals. This dye is in contrast to the imitation purple that was commonly produced using cheaper materials than the dyes from the sea snail. [2]
This is a list of dyes with Colour Index International generic names and numbers and CAS Registry numbers. This list is incomplete ; you can help by adding missing items . ( January 2018 )
A cauldron (or caldron) is a large pot for cooking or boiling over an open fire, with a lid and frequently with an arc-shaped hanger and/or integral handles or feet. There is a rich history of cauldron lore in religion, mythology, and folklore.
In the exhaust method, the dye is transported to the substrate by the dye liquor's motion. The dye is adsorbed onto the fibre surface and ideally diffuses into the whole of the fibre. Water consumption in exhaust application is higher than the continuous dyeing method. [18] There are three corresponding ways of dyeing with the exhaust method.
The thread is lifted now and again on the end of a stick, and again plunged in until it is all thoroughly dyed. If blue, the thread is then washed in salt water, but any other colour uses fresh water. Amateurs may wish to experiment with some of the suggestions, as urine (human or animal) is used in many recipes as a mordant. A number of the ...
Tartrazine is water-soluble [10] and has a maximum absorbance in an aqueous solution at 425 nm. [11] It is one of the oldest known members of the pyrazolone family of dyes. [ 12 ]
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Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity. In an acidic medium, blue litmus paper turns red, while in a basic or alkaline medium, red litmus paper turns blue. In short, it is a dye and ...