Polymetaal

This products is used in two situations:

• When etching: Covering varnish for the back or front of the etching plate. It cannot be used as an etching ground, because the layer remains elastic.
• At Lithography: Hence the name "Auswaschtinktur". Senefelder used this as "Auswaschtinktur". It is intended to enhance the image on the stone. After making the drawing, before rolling in and printing, at a certain point the stone is rubbed with a few drops of auswaschtinktur.

The product specifications of the Martelin covering varnish from Huber:

• based on purified bitumen
• consistency: liquid
• color: brown/black
• density: 0.88 g/cm³
• flash point: 42°C (this NOT the ignition temperature)
• Eeasy to apply with a brush, does not harden and remains elastic
• dilutable and removable with white spirit, etc.

The product specifications of the Martelin covering varnish from Huber:

• based on purified bitumen
• consistency: liquid
• color: brown/black
• density: 0.88 g/cm³
• flash point: 42°C (this NOT the ignition temperature)
• Eeasy to apply with a brush, does not harden and remains elastic
• dilutable and removable with white spirit, etc.