Originally Posted by Spiridonov
I was meaning not painting of stocks but painting of barrels
Thanks, I will be wait.
In my experience iron barrels were quite often painted red with minium (red lead) in the Gothic era; this was most probably an anti corrosive measure as well as it may have expressed the general appreciation of the color red in that period of time.
Although such varnishes have mostly gone from the rusty iron surfaces in the course of the centuries small remains can often still be found in protected areas. Longer barrels of heavier pieces seem to have been painted more often than smaller ones; e.g., I hardly know of any painted little barrel (ca. 15-30 cm) that may have originally been part of a hand cannon.