Copal oil varnish. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Copal oil varnish. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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To prepare copal oil varnish, take 100 weight parts of good linseed oil and boil it in a cauldron with gradual heating. When bubbles begin to appear, you need to maintain an even fire so that the oil boils slightly. At the same time, 15 parts by weight of East Indian copal are melted in a water bath and brought to a boil.

When bubbles begin to appear in the melted copal, immediately pour hot linseed oil into the resin in parts, stirring all the time. When all the resin is well connected with a part of the oil, then it is poured, with constant stirring, into the oil, boiling in a large cauldron. Then pour 1 weight part of manganese borate into a large cauldron and continue cooking for about 2 hours, removing the resulting foam, until the varnish becomes thick and slowly flows from the veil with transparent, golden threads. If you drop varnish on glass, then the drop should be high in the form of a hemisphere.

Once cooled, the drop should look like a thick syrup, stretching into threads. These are signs that the combination of oil and resin has been completed. After this, extinguish the fire under a large cauldron and allow the mixture to gradually cool to 60 °C. Then pour in 70 parts by weight of turpentine, making a test after each addition to see if the cooled drop retains the consistency of a viscous syrup.

If the viscosity of the varnish decreases markedly, then the addition of turpentine should be stopped and the varnish is considered ready.

A good varnish should be golden in color, lie smoothly on the surface to be painted and dry after 6-8 hours. For painted surfaces, where the yellowish tint is not important, this varnish can be considered excellent.

Author: Korolev V.A.

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