USE COPPER AND BRASS OR ALUMINUM UTENSILS
An important aid to cleanliness is the use of copper, aluminum or brass for all parts of the apparatus with which glue comes into contact. Not only are copper, aluminum and brass the cheapest materials to use in the long run, due to their resisting acids in glue, water and steam which quickly corrode iron, but copper, aluminum and brass are practically self-cleaning.
Iron equipment is especially bad. It is most expensive in the end, for iron is quickly eaten away by acids in glue and water. Iron rusts, and the rust impairs the color and quality of the glue liquid. Do not use iron vessels under any conditions.