"Specially formulated reticulation silver alloy contains a lower percentage of silver and a higher percentage of copper (80/20), making it ideal for reticulation." - RioGrande When you heat the surface of reticulation silver (after the depletion guild process is complete), basically the middle "melts" first, causing a ripple effect on the surface. (Notice the ripples, waves and peaks in all of the above pieces of silver...no two are ever the same.) Done effectively, reticulation presents a beautifully patterned surface finish. I have posted a few exmaples of reticulated silver above and as soon as mine is finished I'll be sure to post!
Image sources: The top two and lower right are designed by Kaelin Design, and the lower left image is by Brittany Golden.