I already ran a test set up as following:
I told the users what they were going to buy, showed them the same webpage in eight different colours (four webpages on two rows), and asked them on which webpage they would want to go to buy the product.
The result was that 70% clicked on the top left choice which is not the colour that I expected according to the colour theory. Therefore I think that in this setup users can't think which colour is best and they just click in the golden triangle.
So how should I design such test ?
(knowing that I'll probably be using usabilityhub.com)