First, I have an entity that has a grayscale texture and I would like it to transition between two different colors, how would I do this?

 

Second, when my entity is spawned in, it appears for a few seconds, then disappears for 10-15 seconds and reappears. Is it a current bug in forge or is it something I am doing wrong?

 

Entity class: https://github.com/LogicTechCorp/SoulMagic/blob/1.9/src/main/java/soulmagic/entity/item/EntitySoul.java

Entity render: https://github.com/LogicTechCorp/SoulMagic/blob/1.9/src/main/java/soulmagic/client/render/entiy/SoulRenderFactory.java

Sorry to bump but this kind of got buried under the rest of the posts.

Your entity is disappearing because you told it to

 

        if(this.ticksExisted >= 6000)
        {
            this.setDead();
        }

 

That sets the entity dead after 5 minutes. And the issue still occurs without this piece of code.