Red 40 Lake is Red 40 mixed with Aluminum Hydroxide so as to be non-water soluble. (Yes, I googled!) Didn't see anything about the source of the Red 40 used to make Red 40 Lake, though.
Dave in MPLS / DISCLAIMER: I am not an actual rooster.
"It is better to light a candle than to curse the darkness"
National Suicide Prevention Lifeline 18002738255