Our expert says:
The most important nutrient in spinach is beta-carotene, which is transformed into vit A in the body. Not much beta-carotene is lost if you blanch the spinach. Discolouration of the leaves also does not indicate loss of nutrients, so you can use them if you don't mind the colour. However, the fact that the leaves discolour, indicates that you may be blanching the spinach too long. Basically all the leaves should still be bright green after blanching.
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