Custom armor available rgb colors

hey, i want to add custom armors to my server by using different colored dyed leather armor rgb values for different armor textures.
I want to make sure that normal players crafting dyed armor won't end up having armor with the custom textures on it.

Is there any way of figuring out whether a specified rgb value is obtainable for normal players?
Any sort of calculator that can tell whether a specified rgb color is craftable?
I looked on the minecraft wiki, and it says "There are 5,713,438[1] (34.1% of sRGB) colors leather armor can be"
I just want to make sure i'm not using any colors in that 34% for my custom textured armor.
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