NOTES

1. Barkov, Z. and F. Lambert, “Mechanical Properties of Some Fill Materials for Ceramic Conservation,” ICOM Preprints, Copenhagen, 1984, p. 84.20.1. Also noted are the following: A reference to silica beads in Fidler, J., “U. S. Advances in Preservation Technology II,” Building Conservation, 1, No. 2., pp. 27–29, 1979, and a fill material for pottery including epoxy, fired clay and glass microballoons, in Higuchi, S. and S. Imazu, “New Material for the Restoration of Excavated Pottery,” Science for Conservation, No. 23, pp. 19–32, March 1984. (in Japanese).

2. Anon., 3M “Glass Bubbles Specifications” for C15/250, 70-0701-0995-7-(551)R2, p. 1. Available from:

• Structural Products Department/3M
• 220-7E 3M Center
• St. Paul, Minnesota 55144

3. The American Council of Governmental Industrial Hygienists classifies this product as a “nuisance dust”. 3M Product Information, “Glass Bubbles Storage and Handling,” 70-0701-0999-9(551)R2, p. 2.

4. Barber, Dr. E.C., “Reduce Part Weight and Cost with Hollow Microspheres for Plastics,” reprinted from Plastics Design and Processing, July, 1978, p.2.

5. Tengujo Japanese tissue is available from TALAS, 213 W. 35 St., NY, NY 10001. Rohm and Haas resins B-72 and PVA-AYAF are available through Conservation Materials, 240 Freeport Blvd., Box 2884, Sparks, NV 89431.