Valecnik wrote:WDC wrote: If we don't find a solution to keep the celluloid stable I expect the vast majority of indestructibles and BA's to split within the next 50 years or so.
Norman I know generally the issue but could you please elaborate. That's not a very comforting thought
Thanks, Bruce
Yes, Bruce. It's quite an inconvenient truth to collectors. Basically, all celluloid cylinders face the same chemical problem. Over time, celluloid shrinks. The pricey Lambert cylinders are quite famous for the fact, that they usually need to be reamed with fine sand paper on each edge to fit the mandrel again. But at least the earlier Lambert cylinders have the ability to shrink because of the missing core.
Pure celluloid is very hard but also very brittle material. To make it softer and especially flexible, the record companies added camphor as a softening additive. But camphor (which most of us remember to be used in mothballs) tends to evaporate very quickly, also when added to celluloid. To my knowledge, this is the major reason why the celluloid shrinks. It simply looses a good portion of its own matter. That is why air-tight boxes seem to slow down this process at least a little bit. Until today I have not heard of any attempts to re-lubricate the celluloid, I doubt that it is actually possible but would love to be proven wrong.
Blue Amberols (and most other indestructibles) have a core. And unlike the cardboard of an indestructible, the plaster of paris core of a BA is a quite hard material, hence the celluloid has practically no space to shrink. The result is a significantly increased inner pressure to the celluloid tube around the plaster core. With the constant evaporation of the camphor (it's still in there and when reaming it or wiping with alcohol, you still smell it) the celluloid becomes increasingly stressed by a growing tension - until...
The first signs are the tiny splits at the bottom where the celluloid is thin. And sometimes they do also start backwards, usually caused by shock and/or low temperature. Drilling a hole into the end of a starting crack is a temporal solution but you are only fighting the symptoms, not the disease.
We had a previous thread with the discussion of the humidity problem with the plaster cores and even soaking turned out would not work to let the plaster core swell. This observation fits perfectly into my theory that the swell effect of the plaster core is only a very tiny portion at best. The real reason seems to be more the increased outer pressure from the shrinking celluloid which deforms the plaster core to a smaller size over years or decades. What you then believe to see is a cylinder with a shrunken core that will not fit on the mandrel.
Most collectors and archives seem to still ignore this problem rather than making it public to seek out for possible solutions. Therefore, most books and websites still claim the superior durability of celluloid cylinders. Compared to a well stored wax cylinder, I assure you that wax will easily outlive a Blue Amberol.
Blue Amberols are just another proof for the aging problems with composite material records. Different substances do age differently, a relationship that starts to worse over time.
So, how long will an average Blue Amberol last from now? That is almost impossible to say until the first huge wave of deterioration has begun. 50 years is just a personal guess but it could be 10, 20 or even 100 years either. Again, I would love to hear about solution for this problem.