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Thanks, Ms. Lao. Do you mean the sentence in the original paper? I am sorry I am not post the full sentence first. The full sentence is in the following:No hemorrhages were noted and the areas of venular
and capillary engorgement blanched upon inhalation of ether.
According to this online medical dictionary, "blanch" is defined as "to make white by removing the skin of, as by scalding; as, to blanch almonds." Therefore, whitening is an outcome achieved by removing the skin.