Bigginsbill:

I think that I understand what you mean, please look at the attached screen shot and check me. 

Now another question, what is the difference between a math node and a color math node.  I played around a little more after I logged that post last night and used a Multiply node (NOT color multiply) and got a nice but very subtle effect. not sure what the difference is between the two.

Thanks for your help, and I look forward to your reply.

Mark