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Improved Varnish.
 
Balsam of Canada diluted with pure Spirits of Turpentine to the usual consistence of Mastic Varnish, makes a Varnish that dries soon, & is very brilliant; but as it is apt to chill or bloom, it is necessary to mix it with copan varnish. * When used (a little thinned) on an unfinished picture, it brings out all the colours, and when dry is pleasant to paint on - the colours not sinking in - especially after being exposed to the Sun.

Mastic Varnish.
 
The proportions recommended are one quarter of a pound of gum mastic to a pint of Spirits of Turpentine - dissolved by the moderate heat of a Sand or water bath.

Japan Varnish - Japanners Gold-size.
 
Ivory black, yellow Oker & may be made to dry by the addition of a few drops of Japan Varnish - care being taken that the colour be not made to dry sooner than the other colours dry which are ground with only linseed oil. It should be well combined with the colour, either with the Pallette knife or Muller.

Asphaltum
 
Asphaltum dissolved in Spirits of Turpentine, when employed as a Glazer, must be mixed iwth drying oil & some Megelp. It dries so slowly that it is necessary to expose the picture for a few hours in the sunshine. When this cannot be done, a little Japan may be added.
 
If the prepared Asphaltum be ground with a little Carbonate of Magnesia, it will lose its viscosity & become like other pigments, much resembling mummy.