Opal Potatoes This page first published: Apr 9, 2005 · Updated: May 19, 2018 · by CooksInfo. Copyright © 2021 · This post may contain affiliate links · This blog generates income via ads · Opal Potatoes are short and oval, with pale yellow flesh inside. They are promoted for processing into potato chips (aka crisps in the UK) and for dehydration. Storage Hints Stores well.