Red glue found on joinery of a dining room chair, circa 1940s. (Foto: Miguel Garcia)
Nature of glue: Unknown.
Furniture Manufacturer: Unknown.
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Green Lime glue found one joinery of a dining room chair, circa 1940s. (Fotos: Miguel Garcia)
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Old Polyvinyl acetate (PVA) glue showing presence of mold. The mold is shown s tiny green dots, apparently inside the matrix of the glue, and therefore only visible within the glue coverage area. Apparently the glue was already contaminated with mold before being introduced as adhesive in this join. (fotos: Matt Peterson - Eagle Plane Custom Woodwork).
Old PVA glue used on a mortice and tenon stile of a mahogany chair. This type of PVA glue becomes milky and yellow looking with time, was still adhering well to the wood and becomes gummy when extracted with high-speed mini drill grinder bits. Its dillution with solvents is very hard, even with acetone which dissolves the glue only so much. (Foto: Miguel Garcia)
Casein glue (?) found in board joints in 16th century panel paintings. Casein glue is one of the toughest glues used by ancient woodworkers, because of it's adhesion strength, water resistant and minimal alteration with time. The opaque milky look is a permanent appearance. This glue is described in many old treatises, from which the most famous can be by monk Theophilus and by artist Cenini. - [ Cennino D'Andrea Cennini, The Craftsman's Handbook. The Italian "Il Libro dell' Arte", Daniel V. Thompson, Jr., New York, Dover Publications, Inc., 1933.
- THEOPHILUS, On Divers Arts, The Foremost Medieval Treatise on Painting, Glassmaking and Metalwork, John G. HAWTHORNE e Cyril Stanley SMITH, Dover Publications, Inc.1979, pp. 26-27.]
(Photos: Miguel Garcia)
