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From Wikipedia,

Before we compare the colour Pink & Purple, let’s us 1st understand the difference between Spectral colour & non-spectral.

1. A spectral color is a color that is evoked by a single wavelength of light in the visible spectrum.

2. Traditional colors include: red, orange, yellow, green, blue, and violet.

3. The first division was by Newton, in his color wheel, and he used Red, Orange, Yellow, Green, Blue, Indigo and Violet

4. not spectral colours are:

  • Grayscale colors, such as White, Silver, Gray, and Black
  • Any color obtained by mixing a grayscale color and a spectral color, such as brown – mixture of yellow and black obtained contrast.
  • Purple (similarly, magenta), which is a mixture of Blue and red

In other words, Purple & Pink are non-spectral (in accounting term, it’s call bi-product).

How to differentiate these two colours?

Pink by definition is a pale red colour. A combination of white & red.

Purple, however, is a general term for the range of shades of colour between blue & red. OR in color theory, a ‘purple’ is defined as any non-spectral color between violet & red.

so, in layman’s term, if the colour (in your opinion) has a little blue added in it, then it’s purple! if there isn’t any blue, it’s pink??