FIELD: chemistry.
SUBSTANCE: invention relates to the field of chemistry. The color indicator of return action is based on a double complex compound: hexa dihydrate (isothiocyanate)chromate(III)diaquatris(nicotinic acid) of gadolinium(III), while it has a reversible color change when heated to 135°C, and its composition is characterized by the chemical formula [Gd(C6H5NO2)3(H2O)2][Cr(NCS)6]·2H2O.
EFFECT: creation of a new reversible thermochromic indicator based on hexa dihydrate (isothiocyanate)chromate(III)diaquatris(nicotinic acid) of gadolinium(III), which has the ability to reversibly change color when heated to a temperature of 135°C, available to obtain and convenient to use in practice.
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