Tinting black with blue hue which is well suited for gray color shades.

Added to chromatic colors, the color becomes less chromatic, darker and grayer.
A two pack high gloss paint goes with RZ 2:1 - Fast/Standard Hardener
2:1 Mixing Ratio (i.e. 1L Paint and 0.5L Hardener)
RZ 2:1 Hardener can be ordered here
autocolourbank.com/collections/colour-hardener