Today, I made a cup of lemon tea in a different way than usual. Instead of pouring hot water in to a mug containing lemon juice and black tea (my normal routine), I let the tea steep for a little while before squeezing the lemon. Before adding the lemon, I noticed that the tea was much darker than I am used to. After squeezing the lemon, the tea changed color to a lighter brown and became more translucent.
I could see only a half inch down the side of the cup before squeezing the lemon, but afterwards I could see three inches down, all the way to the bottom. I did not notice any precipitated solids on the bottom of the cup. What happened?