... are you saying you actually heat your rusting solution or does "hot" refer to bite or concentration? Thanks, Keith
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There are some indications that certain solutions work better if heated while being used. I've got a couple of older recipes somewhere that demand that the solution be put into a glass container and hung from the side of the tank into the boiling water to keep it hot. I've never found a need to do that but it seems at a quess that the solution would act more aggresive and the other point is that it's water content would be constantly evaporating during the process making it stronger. Maybe that's why it supposedly works so well!
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As a side note,,always, always wear eye protection. There's lots that can go wrong very quickly with these hot and corrosive chemicals and boiling water. One of the noted gunsmiths/barrel makers of the early 20th Century lost an eye to such an accident while hot rust blueing.
