Well that cleared it up :-o

Although I know how to add, subtract, divide and multiply, translating these functions into the Poser Material Room is still a little beyond my reach.

Here's how I interpret your instructions:

Okay I need to use a Color_math node in order to keep the color, but the values only accept colors and not numbers. 

And that's as far as I get.  I have no idea how to assign "numbers" to them.

If you guys don't want to give the answer away because you think I'm smart enough to figure it out for myself then I've got bad news for you:  although I am a smart person, my brain does not work in the "brainiac" mode that your's does.

Once the instructions are spelled out to me or if I see it visually then I can reverse-technology and make sense of it.  I don't have enough knowledge about all the nodes and their functions in order to think my way through this puzzle from the beginning. 

Yet.

But thanks for trying anyway.