I am interested in color mixing method introduced in this website. I think to get the identical value first is a good way. I believe it works and will give new hand like me a very efficient way to achieve the target color. But my question is how can I judge the value of a color?In other word, while mixing a color, how can I know the value of current color? One should know this before adding light color or dark color, right? Thanks for answering my question!