Abstract
The technical note from Bernier et al. (1984) presents additional observations on our procedure for purifying glycol methacrylate (GMA), a hydrophylic resin (Chappard et al. 1982). It is becoming increasingly popular and widely used as an embedding medium for light microscopic studies. GMA is prepared by esterification of methacrylic acid (MA), but about 1% of free unreacted MA remains in the monomer. MA can copolymerize with GMA and it also binds strongly to thiazin and other basic dyes (Tipett and O'Brien 1975) so as an undesirable impurity it must be removed.
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