I recently noticed that one of my MATORO sets had a slightly off-color arm. It’s a bit hard to tell from the photo, but the arm on the left is the standard LEGO white shade, and the arm on the right looks like it was made with raw, uncolored resin. (Yes, most types of plastic require white dye to get a good opaque shade of white.) It has a semi-translucent quality to it, like some types of low-budget plastic eating utensils. Fortunately the six-way TOHUNGA combiner doesn’t use white arms, so it doesn’t matter much to me.