Preservation and Care of Philatelic Materials
Subsidiary Page
21
Stock Sheets
The following test results by the Salm Foundation indicate that most stock sheets have a
pH of less than 7. All are in the acceptable range.
Stockbook by Lighthouse pH 5.78
Black Sheets by Hagner pH 6.56
White 8419 by Davo pH 6.69
White Sheets by Hagner pH 6.72
Manilla sheets by Master pH 7.88
White manilla strips by Harco pH 8.23
Only three album page interleaves were tested. All proved satisfactory for conservation
purposes:
#3311 by Stanley Gibbons pH 5.26
#332 by Stanley Gibbons pH 5.35
interleaves by Harco pH 5.88
END OF SUBSIDIARY PAGE 21
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