Some brand of bit use color mark to say if the bit is fine or coarse. Different color mean different grit. I have seen bit with this but I do not have any like this so I think you should check with producer brand to see their description which color mean what grit. grit can be noticed by how big is the carving but I think this color code can be good for see difference in fine and extra fine for who has not best eyesight on small detail.
Normally Red is fine grit and Blue is Medium but there are soooooo many variants it’s always best to read the description as they range from extra fine to 4x coarse
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