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1. Aqueous: distemper, casein. Egg tempera does change
the colour slightly over the years.
2. Fir balsam resin: (Strasbourg turpentine fused with
pure spirits of turpentine). A few eye-drops of walnut
oil are added for a tough paint film.
3. All oils alone should be avoided since this will lead to
discoloration even after the pigment is prepared. The
best was achieved with linseed stand oil and pure
distilled turpentine. Even cold pressed walnut oil will
show discoloration within three to four years. However,
a small addition of any white pigment will prevent
noticeable yellowing in oil.
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