Enough about different colors, for now. What about different forms of one color? Artists have some simple terminology for that. If you take some color of paint and mix it with white, you get a lighter form of that color; this is called a tint of that color. If you take some color of paint and mix it with black, you get a darker form of that color: this is called a shade. In other words, light red is not — technically speaking — a shade of red, but a tint of red.
If, on the other hand, you take some color of paint and mix it with both white and black — that is, you mix it with gray, whether light or dark — this is called a tone.
If your memory is as bad as mine, you might want to note the corresponding vowels: white and tint, black and shade, both and tone. (And that correspondence is precisely why I say “both” instead of “gray”,)
One of the reasons I like the HSB color wheel is that its colors can be interpreted as tints, tones, and shades. Oh, let me show you two different forms of it. The large disc at the beginning of the previous post was at full brightness. There was a slider to the right which would have given me a darker color wheel. For example:
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