Cleaning a chrome mask in Sulfuric/peroxide is a very effective way to remove
photoresist and other organic particles. Be careful when preparing the solution
as it is exothermic and will heat to 120 degrees C quickly. You might want to
allow it to cool before using as the shock at that temperature can break the
glass. Same with removing it from solution. Have a heated beaker of di water to
transfer the mask to before placing in your normal di water dump rinser. Bob
Henderson