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250ml of sandarac varnish. Sandarac is the most commonly used varnish for wet plate nowadays. This is the classical gum sandarac formula.
Our varnishes are sold in borosilicate glass bottles, which are easy to clean and more resistant than regular glass to impact and temperature changes.
The use of alcohol based varnishes is suitable for freshly made collodion. If your plate has been shot with an old collodion we recommend you to choose an acrylic varnish to prevent dissolving the image. You could also seal your plate with a glass dome and Canada Balsam.
Adding a few drops of distilled water to the varnish could also solve this problem.
This varnish has a very long shelf life if it’s well preserved.