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(RCSD) Was: Scott v Showgard mounts.
A FYI.
Blakemore (1999) has reported his observations and tests on Showgard mounts. His tests included a comparison of the infrared transmittance spectra for the front face of Showgard mounts and a polystyrene reference sheet. Minor differences were found between the two traces. He also conducted a solvent activity test. He concluded that Showgard mounts, as made in 1999, are safe for stamps. Semeyn (1998) had also expressed confidence in the stability of the polystyrene in Showgard and Scott mounts. There seems to be a difference of opinion here regarding whether or not polystyrene is safe for use with philatelic materials. Campbell's opinion of polystyrene is unfavorable. Perhaps, in view of the lack of agreement, collectors might wish to exercise caution in the use of polystyrene materials. (See Subsidiary Page 18, Plastics.) further reading http://www.stamps.org/care/subp22.htm HTH |
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