[paul.fr]

If i put food colouring in it's bowl, would it change colour?

[another_someone]

I would imagine that the goldfishes digestive system would be more than capable of breaking down any food colouring agent in the food, and if not, then it will probably simply excrete it undigested.

Any change in colour of a goldfish would probably only come about due to metabolic changes in the fish.

[tony6789]

that wud b pretty sweet tho huh?

[tony6789]

i wud think it wud slightly tho it wud b like if u died a pool white u went swimming in it form a long time u wud have a SLIGHT clor change

[Ben6789]

Try to improve grammar, i barely read that.

Maybe it's like the movie Big Fat Liar where he dives into the pool and turns blue.