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litmus pigment paint colorant synthetic dye dyestuffs indicator stain azo diazo chromophore 7-hydroxyphenoxazone hydroxyphenoxazone filter paper lichens roccella variolaria dealbata ochrolechia parella parmotrema tinctorum parmelia dendrographa acidic basic acidity basicity aqueous solution diprotic acid red substance matter material compound component agent reagent functional group synthesis reaction production molecule molecular formula skeletal structural structure blue 3d