Why does rinsing black glutinous rice result in burgundy water?

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Burgundy Water is a Natural Result of Rinsing Black Glutinous Rice

When rinsing black glutinous rice, the resulting water often appears burgundy. This colour change is a natural phenomenon attributed to the pigments inherent in the rice grains.
Natural Pigmentation in Black Glutinous Rice

The grains of black glutinous rice are not uniformly black but exhibit shades ranging from brownish-black to purplish-black. This variation in hue is due to the presence of natural pigments within the rice.
Anthocyanins Responsible for Colour

While the provided information states the burgundy colour is natural, it does not specify the exact pigments. Generally, dark-coloured grains like black glutinous rice contain anthocyanins, which are water-soluble pigments. Upon rinsing, these anthocyanins leach into the water, giving it the characteristic burgundy or purplish-red colour.
Normal Process During Preparation

The colour change observed during the rinsing of black glutinous rice is a normal part of its preparation. It is not indicative of spoilage or any defect in the rice. This natural leaching of colour is an expected outcome when preparing dishes with black glutinous rice.

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Why does rinsing black glutinous rice result in burgundy water?

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