Etching ink, black pickling and cold burnishing agent, liquid medium on acid basis, especially for tin, zinc, copper, special copper and special steel alloys
| Appearance: | blue liquid |
Area of application
The solution supplied ready for use should be poured into a resistant container made of GRP, HDPE or PP.
Degreasing and inserting the parts
The parts to be blackened must be degreased before cold burnishing. In the simplest case, this can be done by washing with alcohol.
Blackening effect:
Thorough degreasing of the parts is a necessary prerequisite for uniform blackening. Depending on the material, blackening occurs relatively quickly (approx. 1 – 5 sec. after application). If NIGRIT ”M-Extra” remains too long on the component, loose oxides will accumulate on the surface, which have to be removed after the process (expediently with a root brush or similar). If the blackening has not become sufficient, the burnishing process can be repeated after the material has been cleaned. Here it has been found that more than two burnishing passes hardly show any significant improvement. If an irregular coloration is noticeable after burnishing, this is an indication of insufficient degreasing.
