Xerox 003R06709 Manual Do Utilizador
Application Ideas and Procedures
Xerox Wide Format Supplies Applications Guide
Version 2.0; April 2005
82
11. Archive Conditions and Specifications
Archival Environment
NOTE: Given the myriad of preparation techniques, which include folding, rolling, flat stacking and hanging of
single or multiple prints, only image legibility is considered.
single or multiple prints, only image legibility is considered.
There are four environmental components that affect image permanence, durability, and therefore legibility: water
content (% relative humidity), elemental content (e.g. salt, NaCl), radiation (exposure to light), and heat.
content (% relative humidity), elemental content (e.g. salt, NaCl), radiation (exposure to light), and heat.
Xerox specifies an ambient archival environment of no greater than 70°F, 50% Relative Humidity, and total
darkness. A temperature and/or humidity lower than 70°F, 50% RH can afford additional increases in permanence
and durability.
darkness. A temperature and/or humidity lower than 70°F, 50% RH can afford additional increases in permanence
and durability.
Conditions of Referral: Each time a print is referred, or removed from archive storage, its environment and,
therefore, archive life expectancy is considered changed. Print referral is restricted to the indoor environment,
utilizing typical office (fluorescent) lights.
therefore, archive life expectancy is considered changed. Print referral is restricted to the indoor environment,
utilizing typical office (fluorescent) lights.
Frequency is described as follows:
1. Low: Once a year, or less, and not in excess of 4 times per year.
2. Ordinary: More than 4 times/year, and not in excess of 12 times/year.
3. High: More than 12 times per year, and not in excess of 52 times/year.
4. Maximum: More than 52 times per year.
Duration of exposure to a non-archival environment is described as follows:
1. Low: No more than 15 minutes per referral.
2. Ordinary: 15 minutes to 1 hour per referral.
3. High: 1-4 hours per referral.
4. Maximum: More than 4 hours per referral.
The state of continuous referral exists when a print is seldom or never placed in an archival environment during its
life; the combination of maximum frequency and maximum duration is considered as continuous referral.
life; the combination of maximum frequency and maximum duration is considered as continuous referral.
Combining a degree of frequency with the matching degree of duration results in a specific number of hours per
year through which the print can be exposed. The hours of exposure dictate the permanence and durability of an
image, and the print life. Varying degrees of frequency and exposure can be combined to yield a general life
expectancy in years.
year through which the print can be exposed. The hours of exposure dictate the permanence and durability of an
image, and the print life. Varying degrees of frequency and exposure can be combined to yield a general life
expectancy in years.