Casting concrete sink - tips and advice on coloring

[Drömmenomhus]

Hello,
I am in the process of casting a concrete sink with the dimensions 1400x460x120 and can't find information online on how to achieve a light gray color similar to this sink.
I plan to mix powdered pigment based on iron oxide. And I intend to use white cement, so I think the amount of color should be less than 1% of the cement weight, as we don't want an intense color on the sink.

Any tips or advice?

https://betongdesign.se/produkt/vejby-handfat-djup/

 

[z_bumbi]

Make a series of trial castings and go as far as including finishing on the most promising samples.