Yellow leather Toadstool turning brown

[Goomba]

There are yellow leathers, just not "lemon" yellow that you might be expecting. I found some images to help explain:

Bleached out yellow leather, what you'd see in a store


Transitioning to normal color, but looks really nice and bright yellow


Natural color that you should expect in the end, right on the mariculture racks in the ocean


There will be slightly nicer ones, and blue leds or actinic bulbs MAY help the yellow pop a bit, but they should all end up about the same