How to tell which colour is which in Guake

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http://askubuntu.com – I'm using Guake for my terminal, but every now and again, it produces some weird colour combinations which make stuff impossible to read. I just want it to be black and white, but I can't figure out which colours are which. It's a long trial and error process to change the colours. Does anyone have a guide to have to work out which colour in the appearance tab is which? (HowTos)