Rhombic-shaped scale device for use in judging discoloration, fa

Details Rhombic-shaped scale device for use in judging discoloration, fa Rhombic-shaped scale device for use in judging discoloration, fa

1986-03-28

1987-12-29

Evans, F. L.

Optics: measuring and testing

By shade or color

With reflective multicolor chart or standard

G01J 352

Patent

active

047157160

ABSTRACT:
A scale device for use in judging the amount of discoloration or fading, or for judging the amount of staining, of a sample after a test of the sample for light fastness of dyeing or resistance to staining. The scale device has a plurality of scales of the same color having a plurality of patches with one portion of each patch having the same luminous reflectance and the other portions of the respective patches having successively varied luminous reflectances so as to give to the patches progressive values of color difference. The luminous reflectance of the one portions of the patches of each scale are different from the luminous reflectances of the one patches of the other scales. Four of the scales are arranged in a rhombic arrangement and the remainder of the scales are in a cross shape within the rhombic arrangement.

REFERENCES:
International Standard ISO 105/A, Ref. No. ISO 105/A--1978 (E), pp. i-5.
ISO 105/A--1984 (E), A02 Grey Scale, pp. 7-8.
ISO 105/A--1984 (E), A03 Grey Scale, pp. 9-10.
AATCC Technical Manual, vol. 59, 1984, pp. 137-142.

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