Editing Drano (section)

== Crystal Drano ==
According to the [[National Institutes of Health]]'s Household Products Database, the crystal form is composed of:

* [[Sodium hydroxide]] (lye), NaOH
* [[Sodium nitrate]], NaNO<sub>3</sub>
* [[Sodium chloride]] (salt), NaCl
* [[Aluminium]] shards, Al

After Drano crystals are added to water, the reaction works as follows:

# Aluminium reacts with lye: 2NaOH + 2Al + 2H<sub>2</sub>O → 3H<sub>2</sub> + 2NaAlO<sub>2</sub>, although the exact species in solution may be NaAl(OH)<sub>4</sub>.<ref>{{Greenwood&Earnshaw2nd}}</ref> The release of hydrogen gas stirs the mixture and improves the interaction between the lye and the materials clogging the drain. It's possible that pressure may build up inside the pipe, causing the hot, caustic solution to spurt out of the drain.
# Sodium nitrate reacts with hydrogen gas:  Na<sup>+</sup> + NO<sub>3</sub><sup>−</sup> + 4H<sub>2</sub> → NaOH + NH<sub>3</sub> + 2H<sub>2</sub>O. This removes hydrogen, which poses a fire and explosion hazard and produces ammonia, which is also capable of decomposing organic material, albeit less aggressively than lye. The sodium hydroxide (lye) is consumed by further action of the first reaction.

Crystal Drano was invented in 1923 by Harry Drackett.  From the 1960s into the 1980s, Drackett advertised ''Once in every week, Drano in every drain''.<ref>[https://trademarks.justia.com/721/66/once-in-every-week-drano-in-every-drain-72166076.html Expired U.S. Trademark Serial No. 72166076]</ref><ref>{{cite web|url=http://graphic-design.tjs-labs.com/gallery-view?product=DRANO|title=Gallery of Graphic Design|access-date=16 October 2016|archive-date=17 March 2017|archive-url=https://web.archive.org/web/20170317161036/http://graphic-design.tjs-labs.com/gallery-view?product=DRANO|url-status=dead}}</ref>

[[Bristol-Myers Squibb|Bristol-Myers]] bought the Drackett Company in 1965 and sold it to [[S. C. Johnson & Son|S. C. Johnson]] in 1992.  Drano has been developed into several forms; {{As of|2016|lc=y}}, the original ''Crystal Drano'' is marketed as ''Drano Kitchen Crystals Clog Remover''.