I would suggest running it regularly (cycling it) for 6 weeks before any adjustments.
The older american lamps are resilient and bounce back with regular running.
As far as a fade (in sunlight) yes.
Add food coloring. Just a smidge and you should be ok. but some have sugar or other additives in them so be careful what you use.
As long as you gave the cycling a try.
then fade and recolor away!