Check-tile for colour measurement instruments

1. A check-tile for validating instrument scales of a color measurement instrument, said check-tile comprising a transparent substrate coated with a multi-layer coating, said multi-layer coating comprising:

A) a pigmented mid-coat applied to the transparent substrate, wherein said pigmented mid-coat is translucent and made of a base coat coating composition I comprising a binder, at least one transparent interference pigment and at least one transparent or semi-transparent solid pigment, and

B) a pigmented ground coat, wherein said pigmented ground coat is opaque and made of a base coat coating composition II comprising a binder and at least one achromatic solid pigment;

wherein said check-tile is of a color suitable for measurement by said color measurement instrument according to a photometric scale and a wavelength scale; wherein at least one reflectance spectra of said check-tile measured within a range of 70° to 115° off the specular is predominated by the color of the at least one transparent or semi-transparent solid pigment; and at least one reflectance spectra of said check-tile measured within a range of 10° to 20° off the specular is predominated by the color of said at least one transparent interference pigment.

2. The check-tile of claim 1 , wherein the pigmented ground coat and the pigmented mid-coat are adjacent to each other in the multilayer coating.

3. The check-tile of claim 1 , wherein said base coat coating composition II is free of effect pigments.

4. The check-tile of claim 3 , wherein the achromatic solid pigment of base coat coating composition II is a white pigment.

5. The check-tile of claim 4 , wherein the white pigment is titanium dioxide.

6. The check-tile of claim 3 , wherein the transparent substrate is a glass plate.

7. The check-tile of claim 3 , wherein the base coat coating composition I and/or II further comprise a coating additive.

8. The check-tile of claim 3 , wherein the at least one transparent or semi-transparent solid pigment of the base coat coating composition I is a transparent or semi-transparent yellow, red or orange pigment.

9. The check-tile of claim 3 , wherein the at least one transparent interference pigment of the base coat coating composition I has a platelet-like core and the platelet-like core is coated with a layer of titanium dioxide (TiO 2 ).

10. The check-tile of claim 3 , further comprising a frame.

11. The check-tile of claim 10 , wherein the transparent substrate is disposed on the frame.

12. The check-tile of claim 11 , wherein the transparent substrate is affixed to the frame.

13. The check-tile of claim 3 , wherein the color measurement instrument is a goniospectrophotometer.

14. The check-tile of claim 13 wherein said check-tile is used for validating instrument scales of color measurement instruments.

15. The check-tile of claim 1 , wherein said base coat coating composition II is free of colored solid pigments.

16. The check-tile of claim 1 , wherein said base coat coating composition I is free of opaque solid pigments.

17. The check-tile of claim 1 , wherein the pigments in said pigmented ground coat consist of said at least one achromatic solid pigment.

18. The check-tile of claim 1 , wherein said transparent solid pigment is present in said base coat coating composition I at about 0.005 to about 0.05% by weight.

19. The check-tile of claim 1 , wherein the pigments in said pigmented mid-coat consist of said at least one transparent interference pigment and said at least one transparent or semi-transparent solid pigment.