Preserving Nicrophorus (sexton, burying beetles0

[bugman7]

Still puzzled by the darkening of the elytra of various Nicrophorus spp. I have not exposed specimens to any killing agents or chemicals. I froze individuals, but noticed darkening about a day after they were pinned out. Any ideas/ experiences? Thanks

[lucanidae25]

Have you tried pinned it first then dry it in the freezer. Try that.