Form 13H-H Spreading Rate Chart
Form 13H-H is a black and white sealed Spreading Rate Chart. The top and bottom of the chart have a diagonally striped or zebra pattern and the center of the chart is divided into a black horizontal area on top and a white horizontal area on bottom. Overall dimensions are 11-1/4 x 17-1/4 in (286 x 438 mm). The white areas of this chart have a slightly higher whiteness or Y-reflectance than the white areas of most Leneta charts: 86 87% versus 81 83.5%.
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