I used to believe that if you mixed exactly the right amount of each colour of poster paint, you would make white. I spent hours staring at a brown pot of paint, gently adding another dab of blue (or whichever) thinking I must be doing it wrong!
A childhood belief about chemistry

others believed things like this
- I used to believe that if you mixed red, blue, green, and yellow paint you'd get plaid!— Judith Ann
- When I was little, I thought that clouds were made by someone spraying white spray paint onto air.— Hadla
- I thought that the jetstream from planes was white paint. Which was constantly poured out from the plane.— Tore
- My sister once asked her mother why she didn't paint her black....Anon
- I used to believe that white people had white poop and that mine was brown because I was brownAnon
- Drinking coffee before your 12 yrs, old will make the white in your eyes turn brown.— dawn b.