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Paul,

Good to get confirmation on the Arches paper label.

I do not think the OCP creates that drop in Lab b value between paper white and dark grey patch. It is the Eboni itself. Sure it is a clear fluid and the one you use is warmer but I recall that the Vivera MK pulls the Lab b value also to similar levels on warm papers while the Vivera MK is a bit warmer than Eboni MK. On more neutral papers the reading of the dark grey patch will still be on the warm side.

The Eboni ink I have here is old, at least 6 years old but I doubt that has changed either. Maybe it is something in the Non-UV cut Eye One Pro measurement with the Share application compared to your spectrometers that do not measure UV influence on the print + the software you use.

A Vivera MK example on Innova IFA24 Decor Art Lab 97.88 -0.33 2.19 paper white and the dark grey patch selected is Lab 26.12 0.44 0.24, continuing to a black Lab 17.01 0.66 1.41. The last is the result of the Vivera MK only, the dark grey patch has Vivera PK in it which is a near neutral ink. Anyway even with a near neutral paper the grey blacks do not swing into -b values. Measured with the same Non-UV Eye One Pro but MeasureTool of Profilemaker to get the right input for QTR linearisation. No OBA in that paper either. I see similar results with an uncoated, no OBA, offset paper: Biotop Lab b 2.30.

With a paper that has a paper white Lab 98 0.0 2.0 and Eboni + OCP medium mixes the measurements over the tone range should stay close to a b 2.0. I will try that with brushstrokes on the papers mentioned here and dilute the Eboni more for lighter patches.

Met vriendelijke groet, Ernst

Dinkla Grafische Techniek
Quad, piëzografie, giclée
www.pigment-print.com

On Fri, Dec 26, 2014 at 6:34 PM, Paul Roark roark.paul@... [DigitalBlackandWhiteThePrint] <DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:

This is the label from the Arches I use:

[image: Inline image 1]

Also on line at http://www.paulroark.com/BW-Info/Arches-label.jpg .

Ernst wrote: "... On Velin Arches Blanc Natural Grain Marquee 300 gsm which
has a Lab 96.2 0.8 6.9 the Eboni 1+5 OCP Kodak Gloss Optimizer brushed on
gave a patch measured Lab 27.6 0.7 2.1. So a dark grey patch near neutral
while the paper is a warm one. Measured with a non-UV cut Eye One Pro."

If I am reading this right, the Lab B dropped from 6.9 for the paper white
to 2.1 for the 1:5 Eboni:OCP dilution, applied by a brush.

With a similar dilution of Eboni with the generic base version C6c, I get
37, 1.6, 2.4 on a paper with a white reading of 95, 0.7, 2.7. With an
older Calibration print the 18% (Eb6M) Eboni to total base + ink
concentration at the 75% patch measures 27, 1.1, 2.2. (Spyder 3 color
meter)

I'm not sure I've ever seen a reduction of the Lab B in actual printing
aside from the 100% black point. So, if you're actually seeing a cooling
of the tone in an area aside from an area of very dense coverage, something
interesting may be going on.

I wonder what that OPC gloss optimizer has in it. The MIS version has a
binder in it. That is what allows their non-coated pigments to stick to
the paper. I believe the Epson gloss optimizer might have clear particles
in it. Something that stays on top of the paper has to be in a gloss
optimizer for it to do its job. So, the questions I would have about the
OCP GO are: What is in it, and will that substance change with time and
light exposure?

Paul
www.PaulRoark.com

On Thu, Dec 25, 2014 at 3:30 AM, Ernst Dinkla ernst.dinkla@...
[DigitalBlackandWhiteThePrint] <DigitalBlackandWhiteThePrint@yahoogroups.com

> wrote:

>
>
> Paul,
>
> I guess the paper is called Arches Aquarelle Grain Satiné 300gr/m2 56x76
> cm in Europe. There is often an English and French description on the
> labels, is it correct what I wrote here?
>
>
> Met vriendelijke groet, Ernst
>
> Dinkla Grafische Techniek
> Quad, piëzografie, giclée
> www.pigment-print.com
>
> On Thu, Dec 25, 2014 at 12:41 AM, Paul Roark roark.paul@gmail.com
> [DigitalBlackandWhiteThePrint] <
> DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:
>
>>;
>>
>> I would stay away from the "blocks" of Arches. The one I tried had a low
>> dmax and the edge had to be cut off to avoid printer damage.
>>
>> I prefer the Arches Hot Press Bright White (not really very bright and
>> prints just like the standard) 140 lb. (300 gsm) in "full sheets" -- 22x30
>> inches (approximately). See
>> http://www.dickblick.com/products/arches-bright-white-watercolor-paper/
>>
>> Paul
>> www.PaulRoark.com
>>
>> On Wed, Dec 24, 2014 at 3:04 PM, richard@...
>> [DigitalBlackandWhiteThePrint] <
>> DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:
>>
>>>
>>>
>>> Paul, is this the uncoated water color paper you use and recommend? I'm
>>> going to give it a try when I get back from visiting family this week.
>>>
>>> Arches Watercolor Block 140 Pound Hot Press Paper - 9 x 12 Sheets
>>> <http://www.amazon.com/gp/product/B0015UI1XW/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B0015UI1XW&linkCode=as2&tag=blaandwhimas-20&linkId=3EJ5BEAOFD2AOKOZ>
>>> [image: image]
>>> <http://www.amazon.com/gp/product/B0015UI1XW/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B0015UI1XW&linkCode=as2&tag=blaandwhimas-20&linkId=3EJ5BEAOFD2AOKOZ>
>>> Arches Watercolor Block 140 Pound Hot Press Paper - 9...
>;>> <http://www.amazon.com/gp/product/B0015UI1XW/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B0015UI1XW&linkCode=as2&tag=blaandwhimas-20&linkId=3EJ5BEAOFD2AOKOZ>
>>> Shop Arches at the Amazon Arts, Crafts & Sewing store. Free Shipping on
>>> eligible items. Save on everyday low prices.
>>> View on www.amazon.com
>>> <http://www.amazon.com/gp/product/B0015UI1XW/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B0015UI1XW&linkCode=as2&tag=blaandwhimas-20&linkId=3EJ5BEAOFD2AOKOZ>
>>> Preview by Yahoo
>>>
>>>
>>>
>>>
>>>
>>>
>>
>
>

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Digital BW, The Print

Re: [Digital BW] Re: placing a collective order to MIS/inksupply from Germany

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