Lab instructors are responsible for supervising the collection of dirty and contaminated glassware (slides, test tubes, beakers, flasks, etc.) and are responsible for seeing that all markings are removed from glassware. There are nylon scouring pads in each lab so that students can remove grease pencil markings from the glassware as it is discarded. It is to your advantage to use the grease pencils instead of the felt tip pens. Tubs for dirty glassware will be provided as will slide buckets.