Page "Bay leaf" Paragraph 7
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Bay leaves have been used in entomology as the active ingredient in killing jars.
The crushed, fresh, young leaves are put into the jar under a layer of paper.
The vapours they release kill insects slowly but effectively, and keep the specimens relaxed and easy to mount.
The leaves discourage the growth of molds.
They are not effective for killing large beetles and similar specimens, but insects that have been killed in a cyanide killing jar can be transferred to a laurel jar to await mounting.
It is not clear to what extent the effect is due to cyanide released by the crushed leaves, and to what extent other volatile products are responsible.
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