That's kind of how we got LSD, saccharin and microwave ovens. (not really "playing with" but not being super careful about safety)

Even when the play is "touching" and the chemicals are "food dyes"? I wouldn't say I'm a risk taker, but even I would probably try that out for giggles.

Even if not intentional, such things happen by accident. Have you ever read up on how the psychedelic properties of LSD were discovered?

> While re-synthesizing LSD, he accidentally absorbed a small amount of the drug and discovered its powerful effects

From https://en.wikipedia.org/wiki/History_of_LSD#Discovery

Clearly you don’t know many chemists? You might as well tell EOD to not play with explosives!

confirmed as correct

> You don't play with chemicals

How else do you learn?

I did, as a kid. Blew up the kitchen. Got good at home chemistry.

Still do at times, but it's much harder to get the good stuff, like KNO3.