Is it a problem to mix red wine and white wine on Pesach because of the Problem of coloring on Yom Tov and is there a way to mix with out running into the problem of coloring?
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Halachafortoday sources the Mishna Brurah 320:56 :
In short: To put red wine in white wine is not a problem; however, if the reason you are doing it is to make it red, then, although it seems that it is fine according to the Pri Megadim, it could be that it is better to stay away from such a thing (another reading).
The Shaarei Tziyon 318:65 writes it is better to put red in the cup and then add the white: this way everyone agrees it is permitted.
Rabbi Shlomo Zalman Auerbach zt'l allowed adding concentrated syrup to water or seltzer on shabbos, saying "this is no different than anyone who mixes water with wine or hot water with tea essence."
I'm no Halachic Authority of any sort, but I believe there is no coloring of food.
If you want to be extra stringent, pour the red wine first. (i've seen Grand Rabbis do that).