1.   So top up when you can, rather than stripping off old varnish and starting again.

2.   Before doing this oil treatment, you have to remove the old varnish, to the bare wood.

3.   He performed a series of cleaning operations, first with solvents, then with a microscope and scalpel, to remove old varnish and remnants of earlier retouchings.

4.   How can I tell whether the old varnish is water- or oil-based?

5.   How should I remove the old varnish and apply the new?

6.   If you use an oil-based polyurethane, you may not have to get rid of all the old varnish.

7.   Removal of the old varnish also revealed a change Rembrandt made.

8.   The subtle colors that emerge from underneath old varnish can be surprising enough.

9.   Unlike old varnish, shellac does not darken with age.

10.   Paintings, frescoes, murals and sculptures were encrusted with dirt, old varnish and wax.