The stem of Melampyrum sp. can turn metallic blue after dying. It is also mention in the literature that bread which was contaminated with seeds of field cow-wheat turned blue, which allegedly caused poisonings in former centuries. Do you know any other plants turning blue after dying?
by Gne1ss
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The blue color can often be due to the waxy surface on the plant. This causes interference with light waves and gives the blue color. This is a very common adaptation in desert or high altitude plants.