The 3 x 3" #98 Blue Wratten 2 Gel Filter from Kodak is used to make color separations from color negatives and for color darkroom printing. The filter can also be used in lighting special effects to change the color on a background or create mood lighting.
Kodak has made improvements over the previous line of filters. The Wratten 2 filters are made of gelatin that is more ridged and durable, and the colors are more resistant to fading and degradation. Fingerprints and smudges wipe easier off the gelatin. The filters are also less sensitive to humidity, and create less static cling. Therefore, they are less prone to sticking to other filters or materials.