Since printing full color gum prints uses multiple negatives (Cyan, Magenta and Yellow), a system for registering is required.

I start with the Cyan negative first (since it prints the darkest) by cutting off the four corners of the negatives.  

Next, I lay the Cyan negative on top of the Magenta negative on a light table and then, with a Lupe, I line up the registration marks. 

Working from opposite corners, I tape each corner of the Cyan negative to the Magenta negative after they are aligned.  

Using a pushpin, I punch a hole in the center of each registration mark.  

The Cyan negative is now registered to the Magenta negative.  I then remove the Cyan negative and repeat the procedure with the Yellow negative.  Once all three negatives are registered, the next step is to register the negatives to the paper.  I usually start printing with the Magenta layer followed by the Yellow negative and finally the Cyan negative. I place the Magenta layer on the sized paper and, working from opposite corners, punch a hole through the negative’s pre-punched registration marks into the paper.  

I tape the negative to the paper and remove the pushpins.  

Now I’m ready to place the print with the attached negative into the contact-printing frame.