Discussion - Member to Member Sales - Research Center
Discussion - Member to Member Sales - Research Center
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06:43:44pm
Sunlight or bleach will do it.
Green ink can turn blue over time due to the gradual fading of its yellow component, which is often less stable than the blue component. Here’s how this might happen:
Photodegradation of Yellow Dyes: Green inks are usually a mix of blue and yellow pigments or dyes. Yellow pigments, especially organic ones, are typically more sensitive to UV light and degrade faster than blue pigments. Over time, exposure to sunlight or other light sources can break down the yellow, leaving behind the blue component.
Oxidation and Chemical Degradation: Environmental factors like air pollution, humidity, or even temperature can accelerate the breakdown of the yellow pigments or dyes in green ink. As the yellow fades or degrades, the blue becomes more prominent.
Acidic or Alkaline Exposure: Green ink can also change color if it encounters substances that alter its pH. Certain yellow dyes are pH-sensitive, and exposure to acidic or alkaline materials might weaken or alter the yellow, again allowing the blue to dominate.
Binder Breakdown: In many inks, the binder helps protect the pigments. Over time, however, the binder can degrade, making some colors more susceptible to fading. Yellow pigments often require more protection than blue, so this degradation can disproportionately affect the yellow, shifting the color balance toward blue.
Roy
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Wow, Roy. AI could not have done it better!!
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Well crap, I thought I had a lottery winner. 
Thanks Roy for the full explanation. It is as I thought, a washed out stamp.
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Using Scott. Stamp on the left has WM 262 which should make it Scott #109 Deep Green. Stamp on right has WM 44 which should make it Scott #68. However Scott #68 is also Deep Green. Stamp on right to me is shade of Blue. Could the stamp be washed out that much or what am I missing?
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05 Nov 2024
06:43:44pm
re: Ireland Mystery
Sunlight or bleach will do it.
Green ink can turn blue over time due to the gradual fading of its yellow component, which is often less stable than the blue component. Here’s how this might happen:
Photodegradation of Yellow Dyes: Green inks are usually a mix of blue and yellow pigments or dyes. Yellow pigments, especially organic ones, are typically more sensitive to UV light and degrade faster than blue pigments. Over time, exposure to sunlight or other light sources can break down the yellow, leaving behind the blue component.
Oxidation and Chemical Degradation: Environmental factors like air pollution, humidity, or even temperature can accelerate the breakdown of the yellow pigments or dyes in green ink. As the yellow fades or degrades, the blue becomes more prominent.
Acidic or Alkaline Exposure: Green ink can also change color if it encounters substances that alter its pH. Certain yellow dyes are pH-sensitive, and exposure to acidic or alkaline materials might weaken or alter the yellow, again allowing the blue to dominate.
Binder Breakdown: In many inks, the binder helps protect the pigments. Over time, however, the binder can degrade, making some colors more susceptible to fading. Yellow pigments often require more protection than blue, so this degradation can disproportionately affect the yellow, shifting the color balance toward blue.
Roy
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08:36:39pm
re: Ireland Mystery
Wow, Roy. AI could not have done it better!!
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re: Ireland Mystery
Well crap, I thought I had a lottery winner.
Thanks Roy for the full explanation. It is as I thought, a washed out stamp.
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