This colourless solid is the dioxime derivative of the diketone butane-2,3-dione (also known as diacetyl).
Dimethylglyoxime LR/AR is white to off-white colored powder with chemical formula C4H8N2O2 and molar mass of 116.120 g/mol.
dimethylglyoxime (DMG) nickel spot test has been questioned because of false negative and positive test reactions. The EN 1811, a European standard reference method developed by the European Committee for Standardization (CEN), is fine-tuned to estimate nickel release around