Digital BW, The Print

I believe they were using bulk irradiation at a facility in Ohio that specialized in handling and testing of very large castings-looking for inclusions or internal cracks. It permitted running mail through by the rail car. The contract was still ongoing not that long ago.

Many materials react to intense X-ray exposure by discoloration.

Regards
Duane

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, C D Tobie <CDTobie@...> wrote:
>
> 
> On Dec 7, 2009, at 7:54 AM, Mark wrote:
> 
> > The severe discoloration problem has been witnessed and reported on  
> > HPR the most, but that anecdotal experience can be in part if not  
> > entirely explained by the popularity of this matte paper.
> 
> My most dramatic example of this was during the Anthrax scare, when  
> mail passing through certain mail centers was have certain undisclosed  
> safety precautions applied to it. I received a fine art matte paper  
> profiling target print (don't recall if it was HPR, but there was a  
> lot of HPR being used at that time) from a customer, only to find it  
> was a surprisingly bright yellow. I requested a replacement target be  
> FedExed to me, and that one came through the expected white tone. I  
> believe the process in question may have been intense UV light applied  
> to kill Anthrax spores, though it could have been a gas of some type.
> 
> C. David Tobie
> Global Product Technology Manager
> Digital Imaging & Home Theater
> CDTobie@...
> 
> 
>   ----------
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> 
> Datacolor
> www.datacolor.com/Spyder3
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