An improved formula for preparing denaturing formaldehyde/MOPS agarose gels. Formaldehyde is included. Gels made with this buffer are considerably less brittle than conventional formaldehyde gels, making handling of the gels much easier. One bottle containing 250 mL is provided. NorthernMax® reagents are the same components included in the NorthernMax® Ultrasensitive Northern Blotting Kits but in larger sizes. These reagents are supplied ready to use and are certified RNase-free. Comprehensive instructions are included.