Composite colors

Wonder what classification of different composite elements can be done, i can see, that, for example, the F22, Typhoon,Airbus and even the italian yak-130 do have special composite surfaces, these are with a dark yellow/orange color (no it is not anti-corrosive paint, these are composite elements).

Now, the T50 and the F-35 don’t use that color, they are grey elements, i can understand that color is not a qualitative feature, but is probably a sign of different elements, most likely the ‘dark yellow’ elements are more commercial.

Wonder if somebody could tell more about it.

Here is the italian yak-130

The composite elements are near the cockpit and compose part of the tail.

Typhoon with canards made of ..composites?, the wing is made of the same material.

F22 with the same material, wonder if all them comes from the same manufacturer with a standard pigment..probably is the natural color of the resin.

Airbus plane with elements.

787

Berkut, full of the same resin/composite element

Different pigment..? (the small yellow carpets are not from the aircraft , btw ;)), this is interesting , because the composites used for the F35 and the F22 seems to be different (despite both are LM products), while the Raptor uses what seems to be standard material, the F35 is using probably something based on a new resin.

The T-50 is not using the same Berkut’s resin, i recall a video where some workers were manipulating fibres, i think were Su-47 elements, not from the PAKFA since the PAKFA’s color is grey, not the brown/orange.

There are some members in this forum that have (or seems to have) some knowledge about it (the ‘oldshape’ mister, for example), some inputs from them would be interesting.