Veloscocity

I have an item with two distinct parts. I would like both parts to be able to be colored differently. I tried to dissect how the potions are colored, but ran into a dead end with `getColor`, which is seemingly the only way the potions' color is determined, yet has no usages. I know I should put the two parts on separate layers and use a custom renderer, but I am at a loss as to how I should actually go about implementing it. I read the forge docs and they don't seem to have any relevant information, and all forum posts I found discussing this are horribly outdated.