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Author Topic: What's the easiest way to remove masking tape from film? John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 05-02-2003 10:41 AM                        quote: ...what is an organic chemist? Learn to be a Organic Chemist!!! Make plastics in your spare time!!! Make your own brewski!!! Why buy drugs, when you can make your own!!! http://www.chemhelper.com/ http://people.ouc.bc.ca/woodcock/molecule/molecule.html http://www.chemistry.ohio-state.edu/organic/flashcards/ http://www.cem.msu.edu/~parrill/ BTW, I am NOT an organic chemist!  |  IP: Logged John Spooner Expert Film Handler Posts: 186 From: South Australia, Australia Registered: Jan 2003 posted 05-02-2003 11:59 AM                     As a matter of interest I had encountered this type of thing in the past, sticky residue on the film from old adhesive tape. I spoke to a professional window cleaner associate and he advised that they use eucalptus oil to remove such residues as left by stickers on glass surfaces. I tried some eucalyptus oil on some sticky residue on a film tail and the residue came off quickly and completely. You may care to try this method to remove the masking tape residue. John Spooner.  |  IP: Logged Adam Martin I'm not even gonna point out the irony. Posts: 3686 From: Dallas, TX Registered: Nov 2000 posted 05-02-2003 12:29 PM                     You should also probably store the trailer wound in the opposite direction for a while to help remove excessive curl and prevent focus problems if you ever get to run it.  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 05-02-2003 01:14 PM                        quote: You should also probably store the trailer wound in the opposite direction for a while to help remove excessive curl and prevent focus problems if you ever get to run it. Film should be wound on the largest diameter core available to minimize "core-set" ("clockspringing") of the film and optimize focus stability. Used 3-inch (75mm) cores should be in good supply, as Kodak makes over 200,000 of them every year: http://www.kodak.com/US/en/motion/support/h1/sizesP.shtml#cores You can always buy cores too: http://www.fpchollywood.com/cores.html  |  IP: Logged William Leland III Master Film Handler Posts: 336 From: Charleston, SC, Registered: Aug 2002 posted 05-02-2003 01:28 PM                        John Pytlak said quote: Learn to be a Organic Chemist!!! Make plastics in your spare time!!! Make your own brewski!!! Why buy drugs, when you can make your own!!! someone quick, remind me why i am a projectionist......  |  IP: Logged Don E. Nelson Expert Film Handler Posts: 138 From: Brentwood, CA, USA Registered: Nov 2001 posted 05-02-2003 04:33 PM                     aahhhhhh,............I was going to ask the F-T Forums how to remove 35mm film from masking tape, so that I could re-use the masking tape and throw the film away, but it looks like I won't have to ask that question now. . Thanks By the way, at lunch today I went to the U.S. Post Office and bought 3 sheets (10 to a sheet)of stamps, honoring :"American Film Making: Behind The Scenes", I was very impressed with how they look. Each stamp is the size of a frame of 35mm film and depicts a different aspect of film making. The film editing one is especially good, now how about a stamp paying tribute to projectionists.  |  IP: Logged Bruce Hansen Jedi Master Film Handler Posts: 847 From: Stone Mountain, GA, USA Registered: Dec 1999 posted 05-02-2003 07:22 PM                     On some realy bad masking tape dried up goo, I used Goof-Off, and then lighter fluid.  |  IP: Logged Michael Brown Phenomenal Film Handler Posts: 1522 From: Bradford, England Registered: May 2001 posted 05-03-2003 05:43 PM                     quote: Just curious what does the 1,1,1 in 1,1,1-TriChloroethane stand for? The 3 Chlorine atoms are all bonded to the first carbon atom. I think.  |  IP: Logged Daniel Fuentz Expert Film Handler Posts: 230 From: Fresno, CA, USA Registered: Apr 2003 posted 05-03-2003 05:51 PM                     Thanks for all the tips/suggestions. I found some old 3 inch 16mm cores at work, so I put two of those together and wound my trailers on those. (Unfortunately the rewind bench we've got is 16mm so I ended up winding them on very carefully by hand.) There was some curling in the film so I wound them the opposite way on the cores. I've decided not to try to clean it until I get access to proper cleaning equipment, since the entire print needs cleaning. (And leaders put back on...) These trailers have more than likely been sitting at the back of some drawer ever since Festival morphed into Mann, so they probably haven't been touched in 15 years.  |  IP: Logged Mike Rendall Film Handler Posts: 78 From: Southampton, Hampshire, UK Registered: Nov 2002 posted 05-06-2003 03:32 AM                     Yep - You're correct... To work out molecules it is usually easier to work in reverse. In the case of 1,1,1-Trichloroethane start with the ethane molecule. This is C2H6, working forward we then know that there are three chlorine atoms replacing 3 of the hydrogens. C2H3Cl3. Finally the numbers tell us exactly what atom(s) the chlorines are on, as was discussed previously, the first carbon. Er - my text diagram didn't work because the system removed all the spaces - watch this space, I will upload a picture.... Sorry to bore people. With regards to Trichloroethane(TCE), it is possible to purchase it from our laboratory suppliers for chemical use. It may be worth trying to see if other companies would be willing to sell it to you in bottles of about a litre? Our laboratory suppliers are : Sigma Aldrich UK Website . P.s. Sorry, I am unable and unwilling to get chemicals for anyone so please don't ask me. Thanks  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 05-06-2003 07:06 AM                        I thought that the European Union had banned sales of 1,1,1 at the end of 1995. I took my film archiving master's degree in 1995-96, and distinctly remember being told in one of the lectures that archives around Europe were busily stockpiling drums of 1,1,1 for their ultrasonic cleaning machines, because it would be illegal to buy and sell it as from the end of that year (95). Maybe he really meant illegal to manufacture it, and existing supplies could still be traded. Percholoroethylene is, AFAIK, the solvent of choice for ultrasonic cleaners now though there was a huge debate about it at the time, with some people arguing that distilled water would in fact be more effective.  |  IP: Logged Mike Rendall Film Handler Posts: 78 From: Southampton, Hampshire, UK Registered: Nov 2002 posted 05-06-2003 07:37 AM                     You are correct in saying that it is not available for purchase for industrial purposes, but it is still available for feedstock usage (i.e. for conversion in the chemical industry to something else.) Mike  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 05-06-2003 03:00 PM                        Aha... so if I try to buy this stuff on the pretext of using it as an ingredient for chemical weapons, then no problem... but for cleaning films... sorry mate! I do remember the lecturer proudly telling us that he had several drums of 1,1,1 stashed under the very room in which we were sitting, which got me wondering whether gas masks might not have been a good idea...  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 05-06-2003 03:10 PM                        quote: I do remember the lecturer proudly telling us that he had several drums of 1,1,1 stashed under the very room in which we were sitting, which got me wondering whether gas masks might not have been a good idea... Obviously, 1,1,1-trichloroethane needed to be stored, used, and recycled properly. But other film cleaning solvents were usually more hazardous (lower TLV) or flammable: http://www.kodak.com/US/en/motion/hse/solvent.jhtml  |  IP: Logged

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