Form 13H is a black and white sealed spreading rate chart. The top and bottom are a stripped pattern, the top part of the middle section black and bottom is white. Overall dimensions of 11-1/4 x 17-1/4 in (286 x 438 mm). The design area of the chart covers 1000 cm squared, to help with calculating coverage.
Form 13H-H is a black and white Sealed Spreading Rate Chart. The top and bottom of the chart are stripped (or zebra pattern). The center of the chart is divided into a black on top and white on the bottom, normally used when a colorimeter or glossmeter are used. The striped sections are better for visual evaluation because of the multiple black/white interfaces. The testing area is accurately 0.1 square meters (approximately one square foot). This form is a bit brighter than most Leneta white charts. It has a “Y” value of approximately 87.