Disappearing Redder Tone after Enzymatic Biopolishing

It's something mysterious. They are using a good dyestuff (RGB's) for dyeing a medium olive green shade. The combination Yellow, Red and Blue RGB, where red is a very small per centage, but a toner to reach that particular shade.

They have dyed the shade and reached the tone and depth. Soaped throughly and after soaping they have collected the sample and found still matching to the shade.

To their surprise, after bio-polishing with a standard enzyme, they found that the red has substantially gone out and the shade was off.

Can any one suggest, what may be the reason for this tonal change?