Solution: Dyes that can be used as pH indicators - NYT Crossword

I’ve simply never heard of this substance, another debut, and it created a problem for me as I considered “can-go reds,” a possible trademark name, and CONGO REDS to be equally likely. The correct term has an interesting history, as these things do, and loads of academic coverage. I thought this relevant to Mr. Walden — he’s a professor at Santa Clara University — but he teaches math and computer science and probably deals more with the cross that stymied me at 30D, BOSSES. I know it makes sense after the fact, but I got this ridiculous old electronic song stuck in my head and clung to “basses” for too long.