I had bleach blonde hair for a while and wanted to go back to my normal color. I used a light ash brown and my hair turned greeninsh grey. I went and bought a kit to take the color out and it didn't work. Should I go for something that has a red base to it?

It's good to know that you've been reading my answers. Some brown hair color contains a green base, which will turn blonde or light hair green. If you want to go brown, minus the green, you will need to use a reddish hair color to neutralize the green cast. Afterwards, you can apply your desired color.