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‘stained grains’ means grains which have undergone, on a small area of their surface, an obvious change in their natural colour; the stains may be of different colours (blackish, reddish, brown); deep black striations are also to be regarded as stains.
värvunud terad on terad, mille väikesel pinnaosal on loomulik värv selgelt muutunud; laigud võivad olla eri värvi (mustjad, punakad, pruunid); sügavaid musti triipe käsitatakse samuti laikudena.