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[Broomies Mate]

If that fades, it will become more purple.

I used to work as a colour matcher in an ink company - colour fade is not really understood, but is something to do with UV radiation changing the chemical makeup of the pigment - it adds extra electrons to the pigment molecule, allowing them to change shape, so the refractive index changes.

White "fades" to ivory>beige.
Pink (the pigment is actually "rhodamine") fades to purple
Red fades to light red

That may be true with ink (I have spent my time with screen-print and digital print), but not with paint.  Paint has a tendency to 'fade' because of a powder like substance which appears on the surface.  Once this is removed (by abrasion) the original colour will return.

[bigegg]

If that fades, it will become more purple.

I used to work as a colour matcher in an ink company - colour fade is not really understood, but is something to do with UV radiation changing the chemical makeup of the pigment - it adds extra electrons to the pigment molecule, allowing them to change shape, so the refractive index changes.

White "fades" to ivory>beige.
Pink (the pigment is actually "rhodamine") fades to purple
Red fades to light red

That may be true with ink (I have spent my time with screen-print and digital print), but not with paint.  Paint has a tendency to 'fade' because of a powder like substance which appears on the surface.  Once this is removed (by abrasion) the original colour will return.

 
Wonder if the "powder-like substance" is the irradiated pigment - would show more as paint is applied as a much thicker film than ink ?