Small bruises in wood can be taken out by wetting the place with warm water, or even with cold water, and rubbing down the grain with sandpaper if necessary. If that is not sufficient, a hot iron, as a flat-iron, held near the bruise, the latter being covered with wet blotting paper or several thicknesses of brown paper, will often remove a quite large dent. The operation can be repeated until it has no further effect.