Digital BW, The Print

The minwax is a soft acrylic.  It doesn't yellow...but as I mentioned has a
tack problem.  It is also relatively high in VOC's...but they are less toxic
than the VOC's in the the Hydrocote.  With the Hydrocote I would suggest
thick rubber gloves and a ventilation fan.  The cosolvent is N-methyl
Pyrrolidinone which is water miscible, but rather nasty.  It is needed to
get the polyurethane into the water solution...this will be a problem with
all of the polyurethanes when you use them in water.  In contrast acrylics
can be formulated without VOC's...there just aren't any architectural
products out there without VOC's because they are formulated for brushing
and rolling...two applications which have very different requirements than
rod coating.  That's why I'm trying to formulate a product specficially for
this market.

Robert



On 12/9/02 10:30 AM, "Paul Roark" <paul.roark@...> wrote:

> Most of the polyurethanes that one can buy locally are aromatic as opposed
> to aliphatic.  The aromatics yellow.  The reason I use and recommend
> Hydrocote is that it is aliphatic and will not yellow.  Of course for
> experimenting, any will do.
> Paul
> http://www.PaulRoark.com
> 
> __________________________________________________
> 
> -----Original Message-----
> From: Shire,Stanley [mailto:sshire@...]
> Sent: Monday, December 09, 2002 9:53 AM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: [Digital BW] Faux Meyer Rod - first dMax test results
> 
> 
> I printed two copies of an image on Somerset Enh. Velvet and coated one.
> Macbeth densitometer says.........
> uncoated - dMax 1.69
> coated  (Minwax water-base poly) - dMax 2.32
> 
> Yow!
> 
> Next test, same image, HWM, results tomorrow
> 
> S.
> 
> 
> Stan Shire, M.Ed.
> Associate Professor/Chair
> Department of Photographic Imaging
> Community College of Philadelphia
> 1700 Spring Garden St
> Philadelphia, PA 19130
> Adobe Photoshop A.C.E.
> Author: Hands On Photoshop 7: Tutorial Workshops
> 
> 
> [Non-text portions of this message have been removed]
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