Mishnah Mikvaos 7:3: If one rinsed baskets of olives or baskets of grapes in it [in a mikveh] and they changed its appearance, it is valid. Rabbi Yose says: dyed waters invalidate it if there are three log of them, but they do not invalidate it due to a change in appearance. If wine or olive juices fell into it and they changed its appearance, it is invalid. What should one do [in such a case]? One should wait until it rains and its appearance returns to that of water. If it contained forty se'ah [of valid waters], one can fill [water] by one's shoulder [i.e. drawn waters which one carried over] and add them into it, until its appearance returns to that of water.

הֵדִיחַ בּוֹ סַלֵּי זֵיתִים וְסַלֵּי עֲנָבִים, וְשִׁנּוּ אֶת מַרְאָיו, כָּשֵׁר. רַבִּי יוֹסֵי אוֹמֵר, מֵי הַצֶּבַע פּוֹסְלִין אוֹתוֹ בִשְׁלשָׁה לֻגִּין, וְאֵינָן פּוֹסְלִין אוֹתוֹ בְשִׁנּוּי מַרְאֶה. נָפַל לְתוֹכוֹ יַיִן, וּמֹחַל, וְשִׁנּוּ אֶת מַרְאָיו, פָּסוּל. כֵּיצַד יַעֲשֶׂה. יַמְתִּין לוֹ עַד שֶׁיֵּרְדוּ גְשָׁמִים וְיַחְזְרוּ מַרְאֵיהֶן לְמַרְאֵה הַמָּיִם. הָיוּ בוֹ אַרְבָּעִים סְאָה, מְמַלֵּא בַכָּתֵף וְנוֹתֵן לְתוֹכוֹ עַד שֶׁיַּחְזְרוּ מַרְאֵיהֶן לְמַרְאֵה הַמָּיִם:

Mishnah Mikvaos 7:4: If wine or olive juices fell into it, and they changed its appearance in part [i.e. the appearance of part of the mikveh was changed], if it does not contain forty se'ah that have the appearance of water, one should thereby not immerse in it.

נָפַל לְתוֹכוֹ יַיִן אוֹ מֹחַל וְשִׁנּוּ מִקְצָת מַרְאָיו, אִם אֵין בּוֹ מַרְאֵה מַיִם אַרְבָּעִים סְאָה, הֲרֵי זֶה לֹא יִטְבֹּל בּוֹ: