Whatman Group manufactures Membranes for Use with Epifluorescence Microscopy. Whatman Group manufactures English mill making fine, handcrafted paper. The Membranes for Use with Epifluorescence Microscopy are high performance membranes ideally suited for applications using epifluorescence microscopy. Black membranes greatly reduce background fluorescence, which results in improved micro organism and particulate visibility. Using these membranes in combination with epifluorescence techniques, rapid enumeration of viable and non-viable micro organisms and particulate matter can be conducted in 30 minutes or less.