This method describes a procedure for determining the brightness of clay and other mineral pigment that has been pulverized under controlled conditions and made into uniformly compacted pigment plaques.
This method describes a procedure for determining the brightness of clay and other mineral pigment that has been pulverized under controlled conditions and made into uniformly compacted pigment plaques.
This is a method for measuring the absolute brightness of clay and mineral pigment. It differs from T 646 in that it uses diffuse (hemispherical) illumination instead of 45 ° directional illumination.
The specimens must be prepared with close adherence to the instructions found in the Appendices.
