Digital BW, The Print

Make of it what you will, Harry. Other papers have faded visibly and 
yellowed in less time under the same conditions. For me, this paper 
is above average FOR AN RC PAPER in both printing ability and fade 
resistance. As they say, Your Mileage May Vary.

Steve

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Harry Lockwood 
<hflockwood@...> wrote:
>
> Steven,
> 
> Ordinary window glass is a pretty good absorber of UV.  Standard 
window
> glaze is about 2mm, a bit more than 1/16 inch.  If your windows are 
1/4 inch
> thick, they are not ³standard.²  Since absorption is exponential 
with
> thickness, a factor of 4 in thickness will be very significant.
> 
> Harry
> 
> On 10/25/07 11:29 PM, "Steven Karafyllakis" <stevekphoto@...>
> wrote:
> 
> >  
> > I put 4 grayscales out in my south window on 7/17. They are 
receiving
> > 10-12 hrs of ambient light a day, with 3-4 hrs in the afternoon 
being
> > direct (but not over-head) sunlight. The window is 1/4 inch 
standard
> > glass.
> > 
> > Two scales are coated with PremierArt, two are not. Of each pair 
one
> > is MIS K4 printed in my R1800, the other Epson K3/SP3800. Each 
scale
> > has a black mattboard strip covering the middle 1/2-inch.  
Readings
> > taken with a Colorvision spectrophotometer.
> > 
> > MIS coated: Start, 2.4   @ 3 months, 2.35    Epson coated:  Start,
> > 2.59  @ 3 months, 2.53
> > 
> > MIS uncoated: Start,  2.31  @ 3 months  2.25  Epson Uncoated: 
start,
> > 2.48  @ 3 months 2.41
> > 
> > Lifting the strip of black cardboard, I can't yet see a divider 
line
> > between the covered and uncovered parts on any of the scales.
> > 
> > The 'b' value of the base started at -3.4, initially went a bit 
bluer
> > (OBAs burning off?) now is drifting back towards yellow a bit, but
> > none of the blueness shifts are visible. This continues to be a
> > warmer than average base color for an RC paper, but with  no rapid
> > yellowing visible, unlike SOME of the RC papers I've tested.
> > 
> > I like this paper, it prints with good presence and tonal 
separation,
> > and the warmer base makes it easier to mat.
> > 
> > Steven Karafyllakis
> 
> -- 
> 
> Harry F. Lockwood
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>