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Most preparations were mounted dry, but some are known in which he used a transparent varnish consisting of resin and turpentine.
He also produced uncovered objects for examination by top-lighting.
The war severely damaged the Dutch economy, and crippled Ypelaar’s business.
He even produced micrometers that consisted of the dissected eye of a horse fly, since the eye facets are of uniform size.
A letter within a case at the Netherlands History of Science Museum reads, “The micrometer, prepared by Abraham Ypelaar in October 1804 at Amsterdam, according to his statement, from a strip of the connected walls of the eye of a horse fly, where the balls have been extracted, has twelve sufficiently equal parts, which taken together form, according to an accurate measurement, almost exactly the half of a French line, and therefore the 24th part of an inch, and consequently each division 1/288th part of an inch. Martin Sas married in 1807, when he was 53 years old, to Jannetje Everts van Essen. Abraham and Anna Ypelaar did not have any children.
These included the usual materials that did not require much preparation, such as whole fleas and lice, small shells, fish scales, hairs, insect wings, corals, pieces of skin, seeds, sands, fragments of stone or ores, etc.
He was, however, very adept at dissecting insects, and mounted tissues such as mouth parts, stings, and tracheae.