The colour of the coolant.
Coloring makes it easier to keep track of the condition of the liquid: the loss or change in colour, usually, indicates the need to refill the cooling system. The specific colour used by the manufacturer is primarily related to the standards that antifreeze complies with (see below). Usually, G11 fluids use shades of green, G12 — red, G13 — blue. However, this rule is not mandatory, there are other principles for choosing colours (for example, Japanese manufacturers "paint" their products according to temperature). In addition, the colour of the dye does not affect the properties of the liquid and the composition of the additives. Therefore, when choosing, you should focus not on colour, but on the official characteristics claimed by the manufacturer.
Now on the market there are liquids painted in the following colours:
red,
blue,
green,
yellow,
orange,
purple,
pink,
pink-purple,
green-blue.
