my friend once took a photo that is remarkably similar to this one. she put the colored pencils in sprite or carbonated soda and got a result that looks exactly like this one
I sent my comment to your shout , this happen fast , my Grandson who was 3 at the time , put the color pencil in my 7-up when I left the room for a minute , decided to put the pencil in my drink, I was a little mad at first , because I just poured it in a glass never had the chance to drink it .... but then it look pretty cool so I took pictures ......
Looks like it was on a tv? Cool picture!