Watercolor Permanence Results Part 9

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unSpookyLaughter's avatar
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Sorry for the delay!

Two things happened:
  1.  The samples of Prussian Blue had to rest in the dark to see if they regained their color.
  2.  I lost my acid-free scotch tape and was too stubborn to go buy another one.  *This is the real hold up here, me being strangely determined to find that tape.  Which I did!  It was in with the holiday decorations.  (???)
  3.  I started a new project to paint one greeting card a day, and I had to really sit down and make a schedule for myself!  I'm up to #45, and my goal is 1,000.  Wish me luck!

Prussianblue1-1 by unSpookyLaughter
When first removed from the window.

Prussianblue2-1 by unSpookyLaughter
After five months of darkness.

Despite the difference between the quality of the pictures, it is still possible to see that in the first picture the Prussian Blue and Antwerp Blue had drastically faded, but by the second they look much better -- weird, and neat. 

Prussian blue paint (PB27), as well as cyanotypes, recover in the dark.  This is one reason, besides limiting light exposure, that museums rotate their collections.

PB27 – Daniel Smith Prussian Blue
Taped to window on May 25, 2013
Removed from window on August 2, 2014
Results: faded significantly and shifted towards green
                recovered in darkness, but still shows some fading

My results do not seem to match the information given by the manufacturer.

PB27 – Winsor & Newton Antwerp Blue
Taped to window on May 25, 2013
Removed from window on August 2, 2014
Results: faded significantly and shifted towards green
                recovered in darkness, but still shows some fading

My results seem to match the information given by the manufacturer.

PB16 – Winsor & Newton Phthalo Turquoise
Taped to window on May 25, 2013
Removed from window on August 2, 2014
Results: no change
My results do not seem to match the information given by the manufacturer, they are better.

Rowney Cobalt Blue Hue
Taped to window on May 25, 2013
Removed from window on August 2, 2014
Results: no change
I could not find manufacturer information.

August2-1 by unSpookyLaughter

PB15 – Cotman Intense Blue
Taped to window on May 25, 2013
Removed from window on August 2, 2014
Results: no change
My results do not seem to match the information given by the manufacturer, they are better.

PB15 – Daniel Smith Manganese Blue Hue
Taped to window on May 25, 2013
Removed from window on August 2, 2014
Results: very slightly faded and more green
My results do seem to match the information given by the manufacturer.

PB15 – Winsor & Newton Winsor Blue, Green Shade
Taped to window on May 25, 2013
Removed from window on August 2, 2014
Results: no change
My results do not seem to match the information given by the manufacturer, they are better.

PB15 – Daniel Smith Phthalo Blue, Red Shade
Taped to window on May 25, 2013
Removed from window on August 2, 2014
Results: no change
My results seem to match the information given by the manufacturer.


Readingthetube23-1 by unSpookyLaughter
What are you looking at here?

Brand - I stuck in some initials to indicate brand.  DS is Daniel Smith, MB is Maimeri Blu and so on.

The name of the color - this is the name the paint manufacturer gave to their paint.  Names are not regulated, and if they want to name their paint something like "Unreal Eyeballs" they can.

The pigment name - These are regulated, and are usually displayed in fine print somewhere on the tube or pan.  They are the color family and number.  For example, PV19 is Pigment Violet #19.  All paints made with PV19 will have similar working properties, but they will not be identical.

A little sun -  The section of the card with the little sun drawn on it is the section that was taped to the window.  The other half of the swatch were stuck in a photo album, stored in a dark corner under my desk.
Taped-1 by unSpookyLaughter

Paint Permanence Testing Results Master PostIt seems like it would be useful to have links to specific pigments, compiled in one place.  Especially as I start rolling through more and more of the results.
If you want to keep your eye on the progress of this project, this is the journal entry to favorite or bookmark.
List last updated:
July 2015
Black Pigments/White Pigments

PBk6, PBk7 - Cotman Lamp Black
PBk31 - Daniel Smith Perylene Green
Daniel Smith Hematite
Blue Pigments
PB15 – Cotman Intense Blue
PB15 – Daniel Smith Manganese Blue Hue
PB15 – D


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