It's cold and rainy in Austin, Texas this morning. After posting those paraphenylenediamine formulas, I was driving off through the rain to get breakfast tacos and daydreaming. I thought: "That old Morris Germain really liked symmetry in his formulas--7 grams of metol, 7 grams of paraphenylenediamine, and 7 grams of glycin. *Ding!* 777. I'll bet that's it!(posted 8330 days ago)