GOODTAKE Concrete Pigment, Black Iron Oxide Pigment Powder, Concrete Cement Dye Color Pigment for Pastel Tile Paint Concrete Cement Mortar Grout (Black, 4 oz)

Please take a look at the pictures. I used this product to make my plaster casting turned grey. It worked fairly consistently. You will notice from the pictures that there was some layering and settling that occured. I have not tried the dye with resin, but the plaster is mixed results. You certainly cannot beat the price.

How many recommend perfect color for concrete or whatever you using

So disapointing... their product description states that the mix ratio of the powder should be at 10% maximum, but it's not nearly enough to get the right color. It won't reach the right color under 30-40% on mixing ratio, and that would make the cement useless, and it would cost wayyyy more that what is anticipated if you follow their instruction. If you want the color that's showed, be aware that it won't happen... Edit: the company seems to really have at heart their product accuracy, they did take measures to make sure the images really represent their product and will update their page. They take my experience seriously and they have an amazing communication service.

Doesn’t adhere to project surfaces. Tried different things to see and they are all bad

This is great. I mixed it with rockite it just takes a lot of powder to get the blue to shine through. For my purposes I put resin over it and it made it a darker blue. For you you might want to put a concrete sealant over it to bring out the color to a darker blue.