Denatured Alcohol: Alcohol with small proportion of chemicals added to render it unfit for drinking; used for cleaning.
Good quality clear wood lacquer
String to suspend the piece
Wind free spraying area
Newspaper
Denatured alcohol ...
2) Testing with a solvent, a destructive test, yes, but one which can usually be done in an inconspicuous area. Useful solvents are acetone and denatured alcohol, but not all dyes are soluble in them, so a negative test in not conclusive.
 See also: Polishing, Jewel, Glass, Case, Surface
  
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