Not all old Clorox liquid bleach bottles are antiques, since some are not old enough to receive such classification. However, early Clorox bottles are collectors' items and classified as antiques.
Clorox first begin distributing its product to private households in 1913. Horse-drawn carts delivered the 5-gallon containers in San Francisco. The introduction of smaller 15-ounce amber bottles followed in 1918, but these same bottles were mass-produced to hold a large variety of liquids. Because of this, unless the original label or a legible remnant remains on the bottle, it's impossible to tell if it originally contained Clorox or another product. Bottles that contained Clorox after are identifiable by a variety of markings including handle styles, markings, etched lettering and glass texture. Collecting these is a growing trend among old bottle enthusiasts, as of 2015.