FIELD: chemistry.
SUBSTANCE: invention relates to a reversible bimetal colour thermal indicator based on a double complex compound – dihydrate of hexa (isothiocyanato) chromate (III) diaquart (nicotinic acid) yttrium (III). Its composition is characterized by chemical formula [Y(C6H5NO2)3(H2O)2][Cr (NCS)6]⋅2H2O.
EFFECT: disclosed thermal indicator has the ability to reversibly change colour when heated to 125 °C.
1 cl, 1 ex
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