Process instrumentation & controls specially offers pic insta - mark etching ink.
It is metal impression ink to etch on metal surfaces. It is transparent liquid. Its looks like a water. It works on the steel, brass, copper, zinc, tin & their alloys. It reacts with metal and leaves its impression on that place in a light dark color. The impression of the ink is permanent. It will not remove by oil, acid, alkalis, rubbing, solvent.
It is applied by coding machine, marker pen, screen printing. It is used in engineering, aluminum, automotive, metal industries for batch printing/marking various information