The Envirostains grey (TL) may give you the antiquing effects you want but using powder is always a viable alternative but will not give you the antiquing look that puddles in the veins and creates that natural stone look
In the long run it is probably easier to have the admixture added to the concrete but in the long run the stain and a sealer will not fade as much if any compared to the colored concrete
The Envirostains grey (TL) may give you the antiquing effects you want but using powder is always a viable alternative but will not give you the antiquing look that puddles in the veins and creates that natural stone look