Anti-yellow shampoo: what is it and why is it purple?

Among the most popular products in the world of blondes, there is certainly the anti-yellow shampoo, which is essential for eliminating any unwanted reflections that may arise.
But why is this product offered on the market in blue or purple? And how do we choose the most suitable for our hair tone?

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The explanation is as simple as it is immediate and can be easily understood thanks to an elementary tool such as the color diagram. Observing the image, one can in fact immediately notice that the purple color is diametrically opposed to yellow, as well as blue to orange.

To counteract an unwanted reflection we will therefore have to apply the product of its countercolour: one shampoo BLU will eliminate the orange reflections, while the VIOLA it will eliminate the yellow reflections.

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