Stop-out Varnish prevents covered parts to be etched in the acid or in ferric chloride solution.
bitumen, rosin and turpentine.
Use in well ventilated room only.
Use a soft brush to cover the areas You want to protect. Methylated spirits or paint thinner may be added to make the stop ground more fluent. Can also be used as a hard ground for subsequent work with the etching needle.
Before the plate is submerged in the mordant, let it dry for at least one hour. Heat and air ventilation speeds up the drying process.
To strip the varnish after etching, use a solvent like acetone or turpentine. Alternatively the MungoLux Cleaner can be used. It is solvent-free and based on modified vegetable oils.