Opto-Alignment Technology Inc. says its white 400 Series Opto-Wipes leave significantly less nonvolatile residue than did its previous wipes. Sodium and chloride ions are a fraction of what could be found in the blue 300 Series, and particulate emission is 2/3 that of the 300 Series. The wipes range from 4 3 4 to 12 3 12 in. and come in quantities from 100 to 200. Custom packages are available. They can be used in assembly, coating and ophthalmic manufacturing plants.