Traces of vanadium in high-temperature combustion products and solutions form droplets of molten vanadates. These attack the passivation layers on metals and result in high temperature corrosion, which can be a concern especially for inner combustion engines. Molten sulfate and lead particulates also have this sort of influence. 1970 https://johnathanrdmsy.blogocial.com/helping-the-others-realize-the-advantages-of-smoke-69826355