Splitcoaststampers - What is reverse masking?

A reverse mask is also known as a "mortise" mask.

Basically, instead of stamping the image and cutting the surrounding paper away from it, then laying it over your original image so you can protect it when you stamp around/over it, you are saving the surrounding paper--you actually cut the image out, and used the surrounding paper to protect the area outside the margins of your original image--so you can fill it.

For example, you want to stamp a jar, and then stamp hearts to make it appear filled.

Stamp the jar on your project then stamp it again on post it note. Trim away the "inside" portion of the jar, then relay this "reverse" mask over the jar. The jar should be seen through the mask, but the surrounding area protected. Now, when you stamp your hearts, they will appear to fill the jar, without stamping over the margins of the jar. When you lift the mask, you'll see exactly what I mean.

HTH,