5x7
Some oil painters use a medium and some use the paint as it is out of the tube. I am
a medium user. A medium, depending on the kind, will thin the paint and
make it flow better and often add a bit of gloss.
When I painted in college (the whole 1 semester I had!) we used copal. I really liked it, but
I doubt it was very healthy for our young lungs. However, we did not
worry about those things then. I don't think anyone realized the importance
of handling the materials with caution. To make a point, almost everyone paints
wearing gloves, something I did not see years ago.
About a year ago, I only used linseed oil mixed with a little gamsol (orderless turps), hence the
half empty bottle. Then someone introduced me to liquin which I had always
resisted because of the way it looks. I'm such a princess!
Liquin thins the paint, provides a soft gloss, and hastens drying--so I am
now a convert.
Someday I'll probably dig out the linseed oil again...we painters are like that. We go
back and forth with out supplies.