I just airbrushed a sq cake in blue to resemble the sea and realise I need lots more practise lol but also now it has dried the blue is way too dark
1. Is there anyway to lighten the cake, I dont have white colour.
2. Is there anyway to lighten the colour before I use them next time.

Thanks

For 'next time' you can add a couple drops of water to the color. For now, if your using fondant,you 'might' be able to carefully wipe some of the color off with a damp paper towel. If buttercream, you could add some white in patches and blend in with the heavy color. The ocean is not all one color anyhow!