Dry-shake color hardener
A pigmented powder broadcast onto fresh concrete and floated in, producing intense surface color plus a denser, more wear-resistant top layer.
What does dry-shake color hardener mean?
Because the pigment and hard aggregate concentrate in the surface, the color is far richer than integral color at a comparable cost, and the surface resists abrasion better. The tradeoff is that the color is only surface deep, so deep chips expose gray concrete underneath. Application requires skill and correct timing, and it is labor intensive on large areas.
In practice
Most richly colored stamped patios get their color from dry shake, which is also why a chipped edge shows gray.