Since my question seems to be ignored in the sticky Proton section, I decided to try and ask my questions this way.Since you all appear to be quite well-informed on the Proton's ins and outs, perhaps someone can help me with this question: Some Protons are painted all-white, and some are apparently bare metal, apart for the 1st stage external tank fairings and shroud. Those must be composite parts.It appears to be arbitrary and not depending whether they are Proton M or K variants - but I might be wrong in that. What's the purpose of the difference in appearance?Thanks in advance!