Concrete Stenciling with Acid-Etching Gelhttp://www.concretenetwork.com Watch a concrete stencil being applied and used with acid-etching gel. The surface was previously acid stained to get the brown/tan color. The acid-etching gel will remove some of this color leaving a stenciled pattern.
Must have for the Chicago Bungalow's limestone. KRUD KUTTER CONCRETE CLEAN & ETCH is ideal for cleaning, degreasing, and acid etching concrete floors, walls, basements, driveways, swimming pools, patios, and containment areas prior to coating, staining or sealing. It can also be used to remove efflorescence (alkali salts) and to neutralize new concrete and new mortar joints on block, masonry, and brick.
DIY How to stain a concrete floor using acid-based stain! This site (by DIY-ers) has the most thorough & easy step-by-step instructions I've seen yet. Be sure to read *everything* on this site, as they perfected their own stain formula for quickest application. You can do this, too!