Commentary for Avodah Zarah 70:11
<big><strong>גמ׳</strong></big> חלב למאי ניחוש לה אי משום איחלופי טהור חיור טמא ירוק ואי משום איערובי ניקום דאמר מר חלב טהור עומד חלב טמא אינו עומד
GEMARA. Milk, what could we be concerned about? If we fear that theys ubstituted it [with the milk of an unclean animal], [the milk of] a clean animal is white and of an unclean animal green! If on account of the possibility of a mixture [of a clean animal's milk with that of an unclean animal], let him curdle it, because a Master has said: The milk of a clean animal curdles but that of an unclean animal does not!
Daf Shevui to Avodah Zarah
If the milk was from an unclean animal (such as a camel or pig), it would have a different color from milk from sheep, goats or cows (clean animals). And if the milk was a mixture, such that it would look like kosher milk, then the milk could not be used to curdle cheese, because milk from unkosher animals cannot be used to curdle. So why should we be concerned about unkosher milk?
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