Like purple, it contains blue in its make-up, so your blue can also work as a good base for this change. You can choose a medium green like olive or darker forest green.

Can you put blue hair dye over green?

If you are open for experiments and don't need clear and bright color which requires a very light base, you may try dying over green hair or teal green hair with another dye without bleaching it. ... Putting blue dye over green hair may help you to get some turquoise shade or dark teal hair.

What color cancels out green?

Red is the opposite of green. Red will neutralize green.