The use of methacrylate monomers for embedding has a venerable history in microscopy. Many formulations have been developed over the years for various purposes, ranging from standard TEM observations to low-temperature embedding. Key parameters include the length of the hydrocarbon chain and the presence and kind of cross linking reagent. In the mixture of butyl and methyl methacrylate (BMM) described here, the monomers are relatively short-chained and there is no cross linker at all. This gives the polymerized material a softness that makes it rather unsuitable for TEM, but on the contrary allows the embedment to be removed after sectioning by a brief incubation in acetone. The latter property is good for immunocytochemistry because loss of the embedment means greater access for the antibody to the antigen. BMM generally preserves structure better than paraffin or glycol-methacrylate, and for this reason is a useful choice for light-level immunocytochemistry, particularly when sub-cellular resolution is desired.