Rosen flux is a weak flux used for electrical work, as it does not corrode. Tinners flux is a cloride salt (that i can't remember the name). it is avalible as liquid or as paste. it will absorbe moisture from the air, becomming acidic and corrode where exposed. most plumbing supplies have the paste. they don't call it tinners flux anymore. (Stained Glass Hobby supply houses also sell these very strong dangerous fluxes)
Also a fat based flux, olic acid also called russian tallow is used for leading for body work, it doesnt corrode. That is as much as i can recall from lost days as millwright.
