Ireland Stamps With Color Anomalies Sc#768 And #779

I saw a discussion here on this topic form 09/18/2013 which was inconclusive.

https://goscf.com/t/34301


I found a similar stamp that was the centre of that discussion (ie #779 with pale yellowish coloration vs the normal Orange). I have also found two #768 stamps with the top left orange coloration shaded to a similar pale yellowish color.

Scans of these stamps are provided here along with stamps having normal coloration. Since that discussion 6 years ago is anyone familiar with these variants? Some believed in the prior discussion that the stamps had been affected by sun or a chemical contaminant. I looked at all of the stamps under UV light and could not see anything helpful but I welcome your views. Rick

I suggest you put normal stamps in full sun for a week and compare.

Yes I saw that idea in the 2013 thread too and will give this a try. As suggested I'll also try covering half of a normal stamp with tape to see if there is a clear demarcation line.

The 10 and 41 may give the same effect as the same ink was used!

The sun fade experiment has begun with two normal stamps of each denomination. One of each is taped to see if a noticeable fade line occurs. Also a chance to test the violet 26 p stamp. We'll start with a week in our sunniest south facing window and report back.

Galeoptix I will test some normal 10p stamps too but have just one of the 41p in my collection right now so won't risk it. Thanks for the suggestion. Will also test the green 32 p stamp while I'm at it.

I asked Roy Hamilton Bowen, the publisher of the Hibernian catalog and an amazing expert on Irish philately about a few similar items with red faded or appearing to be missing. He said that the reds are the first to fade when exposed to UV and that these are common.

These two stamps look very different, but all that happened was that the red has faded. If you look at them with a 30X loupe, the red dots are still there, just very faint.

Thank you philatelia. Interesting and very helpful! In your case the Red also went to yellow. Will see how my sunbathing Art Treasures stamps on the window ledge make out as time goes by..

Rick

Working through the remainder of this Irish Art Treasures series I found another undescribed color variant, (top two stamps below) this time with Scott 794 the larger 32 p self adhesive die cut perf 11. The normal green (lower image) looks to be blue green in the upper stamps. I'll also set out one of the normal stamps in the sun with the others to see if this may be due to UV fading. Other feedback welcomed.

Colour changelings
Green fades to blue...

Or http://stampsmarter.com/learning/Ar...gelings.html

See John Becker's image at top of the page, he did the same light/UV exposure experiment (on different stamp).
Don

Wow. Pretty dramatic. Thanks Rod!

Rick

A good article Don. Many thanks for sharing it here.

Rick