Figure King #218 Scans: Masterpiece Optimus Primal, Transformers Adventure, Legends Titan Masters

Overcracker wrote:Not sure, why Primal continues to have a blue chest. But he still looks pretty cool.

Sabrblade wrote:I'm glad to see that most agree that the gorilla chest, gorilla faces, and robot chest are too blue when they should be silvery gray with a slight hint of a blue tint.

The most understandable speculated-explanation I've seen comes from something TF_JW wrote elsewhere:

Whatever color, it should definitely be the same color as his hands and feet in gorilla mode. It's all exposed gorilla "skin".

I think what happened is that as Season 1 progressed, the animators found that blue light sources cast the most dramatic shadows/highlights across Primal's skin tone. So while in early episodes there's a lot of "natural" light causing the gorilla skin to be more flat/gray, they kept playing with the lighting in different situations and really came to like the blue. I certainly remember him being in dim lighting with a blue light on him on more than one occasion.

And while this makes sense for why he's blue here, I'm with those who feel that the gorilla skin (face, chest, hands, and feet) should have all been the same shade of shiny gray, and the robot chest as almost the same gunmetal as his robot waist and robot toes.

Much like this: