As concrete comes to be recognized more and more as a versatile building material with structural possibilities, a new stress is being put on decorative finishes. Many startling and original methods have been worked out in recent years for obtaining such finishes. The oldest technique and probable the most commonly used is that of tooling, or chipping into the hard finished surface to get a new over all effect. Although different tools produce different effects, the basic idea is to remove the smooth outer layer of hardened cement paste and thus reveal the rough textured aggregates below. Once you have started tooling, finish the entire job as soon as possible to get a consistent finish. After finishing, brush the surface well with a clean stiff broom to remove dust and loose aggregate particles. The last step is to hose the entire surface down.