Possible camo (winter?) gas mask can

[Edward Lionheart]

Hello. All gas-masks cannisters I have seen so far that were not camouflaged with washable paint had a tendency to see their color change over time, white turning into light cream, very pale yellow or even showing pink shades.
In my opinion it would be surprising that white paint may change into this color in such a homogenous way. The actual color is hard to define, it changes quite a bit from a picture to another, and from the two sets of pictures, but it seems, at least to me, more like a rocky terrain camo than a winter one.