Proceed as follows;
Mix 1 part stone powder with 1 part cement. Add water to this until a thin mix forms in the case of pinholes. In the case of a major repair, add less water, so much so that you have a clayey substance.
Now you can add black pigment step by step until you have reached the colour of your concrete project. Remember that this mix dries lightly, so it's best to damp your concrete project to compare and match the colour well.
In the case of a newly poured concrete slab:
After you have wetted the whole countertop, rub all the holes or the corners well with this mixture and brush off the excess mix with, for example, a putty knife.
Cover the entire concrete slab with a damp cover foil to avoid colour differences!
-Add yourself: 450 grams of cement
For the accurate measurement of pigments, among other things.
0.01g precision, max. 500g
Necessary for accurately measuring of liquids such as superplasticizer