Rather that clutter Justin’s build thread with glue matters I thought that I would reply to Bill in a new thread:
If it gets a life of its own, so be it!
Sailtwister (Bill) wrote:
<<I didn’t know that! However, I think there is a difference between acetate and celluloid. The story I heard was that Ambroid was originally made by dissolving old B&W Acetate movie film, resulting in it’s amber color (hence it’s name), which apparently had a relatively short lifespan as film, and this was one of the reasons they switched to celluloid for the movie industry. However, I would suggest that if acetate and celuloid really are the same, it is still being used in the film industry, since there are still many older movie theaters in this country that haven’t been able to afford the new digital technology. I think most of the actual filming process is still done on tape (shooting & editing) but then converted to film to distribute to the older theaters.>>
Taking this a bit at a time:
Celluloid - probably the second plastic to get into use- is cellulose nitrate in a transparent form. (Yes, you with the raised hand; guncotton is also cellulose nitrate extruded as threads as a propellant explosive)
Films were all celluloid until non-flammable film stock was developed, and running celluliod close to a very hot bulb is bad news - see all the movie theatre fires!
All film stock now is non-explosive, only the achives are still nitrate stock, and sadly they self-destruct even if kept in the dark and very carefully.
Dope (shrinking - aka nitrate dope) is cellulose nitrate and acetate dissolved in light solvents - highly flammable, but not explosive. Non shrinking dope is, (I believe) celluluse butyrate similarly dissolved but it seems to be found only in the US.
Going back to 1918 an dthe end of WW1 - Dupont had been making guncotton in staggering quantities - had thousands of ton without a home, and tried dissolving it in various solvents to make lacquers - the result was cellulose paint (Belco in the UK) which covered cars from the 20s to about the 70s.
Another spinoff was the airbrush - required because using cellulose finishes with a brush was near-impossible (but not quite)
A quick return to cellulose - its a natural molecule.
Balsa is tubes of cellulose held together lightly with a natural resin called lignin. It is the lightest hardwood cos the tubes are large and there isn’t much heavy lignin.
I don’t want to bore anyone - tell me to stop or go as you prefer