Mesorat%20hashas for Tahorot 3:1
הָרֹטֶב וְהַגְּרִיסִים וְהֶחָלָב, בִּזְמַן שֶׁהֵן מַשְׁקֶה טוֹפֵחַ, הֲרֵי אֵלּוּ תְּחִלָּה. קָרְשׁוּ, הֲרֵי אֵלּוּ שְׁנִיִּים. חָזְרוּ וְנִמֹּחוּ, כַּבֵּיצָה מְכֻוָּן, טָהוֹר. יוֹתֵר מִכַּבֵּיצָה, טָמֵא, שֶׁכֵּיוָן שֶׁיָּצְאָה טִפָּה הָרִאשׁוֹנָה, נִטְמֵאת בְּכַבֵּיצָה:
Sauce, ground beans, and milk, when they are a liquid and able make other things wet, [they are considered liquids such that] they are [made] primary [i.e. of a first degree level of impurity, if they become impure]. If they congeal, they are [able to become] of second degree [like foods in general]. If [when impure] they were then re-softened [into liquid], if there is exactly the equivalent of an egg [in volume] of them, they are pure [since they lost their impurity status in shifting states]; if there is more than the equivalent of an egg [in volume] of them, they are impure, since once the first drop came out [and softened into liquid] it was rendered impure by the [remaining] egg's volume [which is a sufficient amount of food to render impurity, and the rest of the food, as it softens, is rendered impure by that impure liquid, since liquids of any amount can be rendered impure; but when there is exactly an egg's volume of food, the first drop of it that softens into liquid is not rendered impure by it, since there is not a sufficient measure of food left there to render it impure, since foods are only rendered impure and render impurity when there is at least an egg's volume of them].
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