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jno Thurs 15/05/08 16:02
hold a lit match under it?
dundurn Thurs 15/05/08 19:46
If it's totally smooth, no surface lines, indentations and one colour - probably plastic. If there are striations on the surface and a fair amount of pitting especially if the pits tend to be darker that the rest of the material - probably bone. Fine striations (straight, wavy or cross-hatched) but with few pits - probably ivory. Even experts can disagree sometimes at first sight.
Lil O'lady Fri 16/05/08 19:57
Dundurn's right, bone / ivory and plastics / resins often fox even the experts.
One good trick is to get a magnifying glass and look underneath handles, in-carved bits etc. If this is moulded ie plastic or resin, you will see either a 'seam' of raised material or evidence of such a seam being filed away. If it is carved bone / ivory you will see the tool marks of the carver, extending the artwork under the handle.
With even greater magnification you can see the structure of the bone / ivory which difers from the structure of plasics but this is one mother of a magnification.