Hot Salts do not affect brazing nor lead-free solder. It doesn't look right on a double regardless & as stated should Never be used on one with lead solder joints. They will also eat up anything of aluminum in short order.
True that. If you own a fairly modern Spanish, Italian or Turkish gun...its going to have brazed ribs and the barrels and furniture metal will have been hot salt blues/blacked. And virtually all furniture is finished using salts. Nothing to be afraid of if they (hot salts) are used properly and the metal is prepared appropriately. Fresh salts often give the best finish.
