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Post by johnsonsau on Oct 7, 2016 3:50:59 GMT
I would say it is water staining and decomposition of the specimens. Some catchers normally brings in specimens after many days where the specimens starts to (or to some extend) decompose/rot producing some of these brown juices. If the specimens manage to dry up before these brown juices spreads across the veins then the specimens looks ok (whilst in some instances the brown juices spread through the vein or near the basal areas while drying and ended up staining the specimen). If these in midstage decomposting specimens which managed to dry properly are rehydrated with excessive water the brown juices are able to stain the wings again.
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Post by Adam Cotton on Oct 7, 2016 11:55:23 GMT
I think johnsonsau's explanation is very plausible indeed. In hot humid tropical conditions once specimens are killed they can decompose very quickly indeed, and even after a few hours brown fluid can start to accumulate inside the body.
Also if the specimen is killed before the veins have completely dried out and starts to rot very soon after, brown fluid can certainly travel along the veins and stain the wings.
Adam.
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