Turn Flowers Into Different Colours! by Turn Flowers Into Different Colours! Get lots of water and put it in a tight fit vase. Add any colour food colouring to the water. Put your flower in the coloured water. I thought blue worked the best. Wait about 6 hours and you will have a Coloured flower! ๐Ÿ˜‹That's how it will turn out at the 6 hour stage! Hope it works ๐ŸŒบ