Featured Peace and Plenty Pressed Glass Pitcher

Or jug? Anyway - saw this, was intrigued, though I might learn something interesting.
I found a wee number inside (!) so that and the words of course helped a lot.
I think I got the colour represented fairly well. Seems this is Greener & Co.
I saw in an archived discussion that it is in Jenny Thompson's book "The Identification of English Pressed Glass" on page 68, plate 35, dated 14 Dec., 1888.
Mine has the correct registration # (115743) to correspond to that mentioned.
My question is do you think it was made this colour or did it turn this colour ?
I only found a couple and they looked clear.
Thank you in advance.

 

Hi,
It looks sun purpled which is considered damaged. Around 1916 the glass companies started using Manganese to make the glass mixture more clear. The sun turned the glass a slight lilac shade. About 40 years ago people started to use ultraviolet light to turn the glass purple. If they did it long enough it turned it dark purple almost black. I do not consider it damage but I like the light purple shade.
greg

 

I also like the light purple colour .. nice pitcher Tom !!! ... Joy.

 

If it's caused by exposure to sun, I'd call the color ultraviolet.

 

It was the colour that first caught my eye. I thought it was some hokey fad thing from maybe the '50s at first, but then I thought mmmmm...maybe not...
I like it. And - it was interesting to read about the Anti-Corn Law League whose motto allegedly was "Peace and Plenty".

 

Is the color even throughout?

 

Now the sun has set it seems even in incandescent light. It looked more intensely coloured in areas with the sunlight hitting it. But when I moved it the intensity would vary or move. In photos #4 and #5 the sunlight is to the left. It made me curious as I thought if it was intended to be amethyst-like then it would have been more deeply coloured when it was made.

 

Greg, I think you have the date wrong.
Manganese was put in glass during the 1800s. It was around WWI that they started to use lime instead of manganese.
Believe Manganese was a detriment to the workers health. Will have to check on that.

 

I found a couple of articles on solarization of glass. The 1st is from the Corning Museum of Glass.
https://libanswers.cmog.org/faq/144135
In this next the purple effect is dealt with right at the top, then it goes on to other colours.
https://www.thesprucecrafts.com/how-colored-antique-glass-is-made-149114

 

I'm not convinced it's sun purpled. I've seen an awful lot of old British pressed glass - clear - and none that's been sun changed. That looks ligt amethyst.

 

you can check with black light for manganese; you need to be in a dark room to see a faint yellow/green glow, and may need to turn/rotate the glass to see the glow, as it is more apparent is glass with more design detail and at the edges of the glass.

http://www.patternglass.com/this_color_purple_99.htm
http://www.patternglass.com/blacklights.htm

 

Lime has been used in glass forever, not as a de colorant but a filler. Manganse has been in use since probably the middle 1800s. Other chemicals have been used also, mostly since WWI. Direct sunlight changes the valence of manganese in glass to exhibit a purple shade.
I've always thought the pale yellow/green glow was from calcium, Calcite (mineral) reacts the same way.