I guy once brought me a nice reverse painting on glass. Very old. He wanted it reframing. In the four feet from his car to my door
he managed to crack it across the middle.
It depicted a horse with a bit of straw round it's hooves. No background. The crack went from one side to the other right though the horse.
I thought a bit and then had an idea.
I put a piece of mountboard behind, made a pencil mark where the crack was and got my paints out. The crack became the top
of a hill and I loosely filled in a background. With another piece of glass on top the crack did not show as it was perfectly in
register with the hillside.

The background colours were very muted and where the crack went though the horse it didn't
show when held together.
A sneaky trick, but it ended up better than it had any right to be.
