The problem with your analogy is already identified by you. Colors may be fuzzy to the eye, and hard to dicern, indeed. But with instrumentation that can measure wavelengths, it is easy to dircern and define.
Great so at what wavelength does red end at?
There is no better love between 2 people than mutual respect for each other WT Young, 2002
Who gave anyone the authority to call me an authority on anything. WT Young, 1969
Since Evolution is only ~90% correct it should be thrown out and replaced by Creation which has even a lower % of correctness. W T Young, 2008
™ Version 4.2