| http://www.w3.org/ns/prov#value | - A color former is a precursor compound of a coloring matter which forms colored information such as characters and graphics, a developer is a compound which develops a color former by the interaction (primarily, exchange of an electron or proton) between the developer and the color former, and a decolorizer is a compound having a property that preferentially dissolves one of the color former and t
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