Digital BW, The Print

Wednesday, May 22, 2002, 12:56:29 PM, Editor P.O.V. Image Service wrote:

EPOVIS> Paul Roark wrote:

>>\ufffd\ufffd If the process
>> is oxidation, then even dark stored prints would be expected to "age," 
>> even
>> if at a rate that is much slower than one exposed to light.
>>
>> <http://docs.yahoo.com/info/terms/> 

EPOVIS> The process GENERALLY (in acid-free papers) is the result of either 
EPOVIS> light or gaseous interactions.

EPOVIS> Light induced fading can be tested for by placing the print in a vacuum 
EPOVIS> and exposing it to light..

EPOVIS> Gaseous interactions are generally\ufffd either oxidation or the results of 
EPOVIS> free-radicals (chlorine, ozone, etc.)..

EPOVIS> That's why the "display behind glass" figures are so pointless to me 
EPOVIS> except as a baseline for generalized comparisons (like EPA gas mileage 
EPOVIS> figures).\ufffd The amount of gaseous interaction "behind glass" is so 
EPOVIS> reduced from what the average print sees in lits lifetime that it bears 
EPOVIS> little relationship to reality...

EPOVIS> The sad fact?\ufffd Most of these gaseous interaction problems have been long 
EPOVIS> known in the dyestuff industry.\ufffd As an example, the cyan dye 
EPOVIS> disappearance that lays at the heart of the problem with 1270/1280 OEM 
EPOVIS> inks has been know as "Gulf Coast Fading" and recognized in the US 
EPOVIS> chemical indsutry since 1955..\ufffd 

EPOVIS> The OEM manufacturers tend to develop inks incrementally, changing 
EPOVIS> colors bit by bit in each inkset to increase longevity.. The problem 
EPOVIS> with the 1270/1280 cyan dye was it had been changed from the previous 6 
EPOVIS> color inksets to increase lightfastness.. BUT, EPSON never tested for 
EPOVIS> gaseous interactions in general environmental conditions.. They ASSUMED 
EPOVIS> that their changes left that part of the inks characteristics 
EPOVIS> unchanged... DUMB move!\ufffd But, they "needed to get the product out the 
EPOVIS> door in conjunction with their standard release cycle."\ufffd 

EPOVIS> AND, as we all know, the real dyes/pigments are not OEM developments... 
EPOVIS> they are developed by the Chemical Companies and simply incorporated 
EPOVIS> into carriers for the particular printers.\ufffd That's part of why I prefer 
EPOVIS> dealing with ink/chemical companies for my inks.

EPOVIS> [Keith]
 
 




EPOVIS> [Non-text portions of this message have been removed]


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Hello,

My 1160 is on the way, as is, a set of FS carts from MIS. Can anyone
give me an approximate idea of how many 13x19 prints one can get on
average from one set of carts?

Thanks.

Best regards,
 Richard  

mailto:richard@...