Cratering
Cratering is the careful sanding of a surface to expose layers of paint or other materials that may have been applied to it. The sanding is done in a circular motion with a medium sandpaper until the substrate is reached. The crater created is then polished with a very fine sandpaper and mineral oil to make the layers more visible. The layers are then examined under magnification. Much information maybe determined in this manner. This method is best when used in conjunction microscopy. Please note the numbered layers. Number 1 is the wood substrate and number 10 is the current finish. Number 3 is interesting as it is a colored varnish use frequently in the 30's and later to make painted wood appear stained.
