Yikes! Sorry about that! I haven't noticed a chemical taste or any kind of aftertaste when I used it in foods. The ingredients of True Lime are (in order) Citric Acid, Maltodextrin, Lime Juice, Lime Oil, and Ascorbic Acid (Vitamin C). I would assume the lemon is the same, only with (ta da!) lemon juice and lemon oil. I just sprinkled a little True Lime in my hand and tasted it, and while it didn't taste like fresh lime, it still had lime flavor.
BTW, if I ever disappear like that again, just PM me. I just forgot I had responded to this and forgot to check it again!