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Guncotton manufacture ceased for over 15 years until a safer procedure could be developed. On average, this grade is about 1 inch over 8-feet. Since the most common home pool table is 7.5-feet long, this makes for about an inch slope when the table is placed lengthwise in the garage. While this article has discussed popular choices and practical implications of pool table colors, one’s personal connection to a color shouldn’t be underestimated. While guncotton is dangerous to store, the hazards it presents can be minimized by storing it dampened with various liquids, such as alcohol. In his From the Earth to the Moon, guncotton was used to launch a projectile into space. As a projectile driver, it had around six times the gas generation of an equal volume of black powder and produced less smoke and less heating. By coincidence, a third chemist, the Brunswick professor F. J. Otto had also produced guncotton in 1846 and was the first to publish the process, much to the disappointment of Schönbein and Böttger. Many films produced during the early 20th century were lost through this accelerating, self-catalyzed disintegration or through studio warehouse fires, and many others were deliberately destroyed specifically to avoid the fire risk.

Acetate film manufactured during the era when nitrate films were still in use was marked "Safety" or "Safety Film" along one edge in dark letters. Cinema fires caused by the ignition of nitrocellulose film stock commonly occurred as well. The British chemist Frederick Augustus Abel developed the first safe process for guncotton manufacture, which he patented in 1865. The washing and drying times of the nitrocellulose were both extended to 48 hours and repeated eight times over. Further research indicated the importance of washing the acidified cotton. Anyone who recognizes the importance of real Kraft cheez wiz is a kindred spirit with me. For those unfortunate neo-anti-Luddites who refuse to acknowledge the value of anything not available on the Web, I suggest, at a minimum, reading the MIT Guide to Lockpicking, which, while not perfect, has the virtue of being free (and readily available online). Schönbein collaborated with the Frankfurt professor Rudolf Christian Böttger, who had discovered the process independently in the same year. Around 1846 Christian Friedrich Schönbein, a German-Swiss chemist, discovered a more practical formulation. A few years later in 1838, another French chemist, Théophile-Jules Pelouze (teacher of Ascanio Sobrero and Alfred Nobel), treated paper and cardboard in the same way.

A few more require various amounts of cash as an incentive to cough up the details. Later that same month, many more reels and film cans of negatives and prints also burned at Edison Studios in New York City, in the Bronx; then again, on May 13, a fire at Universal Pictures' Colonial Hall "film factory" in Manhattan consumed another extensive collection. The use of volatile nitrocellulose film for motion pictures led many cinemas to fireproof their projection rooms with wall coverings made of asbestos. The use of nitrate film and the looming threat of its fiery potential were certainly not issues limited to the realm of motion pictures or to commercial still photography. Related fires in other medical facilities prompted the growing disuse of nitrocellulose stock for X-rays by 1933, nearly two decades before its use was discontinued for motion-picture films in favour of cellulose acetate film, more commonly known as "safety film". After two minutes, the cotton was removed and washed in cold water to set the esterification level and to remove all acid residue. The acid mixture was changed to two parts sulfuric acid to one part nitric.

The method was to immerse one part of fine cotton in 15 parts of an equal blend of sulfuric acid and nitric acid. Unwashed nitrocellulose (sometimes called pyrocellulose) may spontaneously ignite and explode at room temperature, as the evaporation of water results in the concentration of unreacted acid. Nitrocellulose was found to gradually decompose, releasing nitric acid and further catalyzing the decomposition (eventually into a flammable powder). Nitrocellulose was used as the first flexible film base, beginning with Eastman Kodak products in August 1889. Camphor is used as a plasticizer for nitrocellulose film, often called nitrate film. Nitrocellulose film base manufactured by Kodak can be identified by the presence of the word "nitrate" in dark letters along one edge; the word only in clear letters on a dark background indicates derivation from a nitrate base original negative or projection print, but the film in hand itself may be a later print or copy negative, made on safety film. Projection rooms may also be required to have automatic metal covers for the projection windows, preventing the spread of fire to the auditorium. Those additions intended to prevent or at least delay the migration of flames beyond the projection areas. You cannot smooth rough water with a flatiron.

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