I have an LV Vernis Houston in a light green. It does not seem to be colour transfer but rather purely discolouration. I don't mind colour fading, but it's so uneven that its ugly! I have one idea - if the discolouration was caused by light, if I kept it under a strong UV light or used a concentrated blue light, maybe the discolouration would even out? That way it would be faded but at least even in colour.