SOLUBLE 2 oil is a metal-working fluid designed to emulsify easily with water and is especially effective in the machining of ferrous metals. It is also suitable for the machining of nonferrous metals where some discoloration of the work-piece is acceptable. It has an effective rust inhibitor and a bactericide to prevent disagreeable odors. In its heaviest concentrations (1 part oil to 10 parts water) it is suitable for slow-speed, medium to heavy machining operations that include threading, tapping, drilling and broaching.