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Author Topic: Lovely Mdina? iridescent turned over rim bowl.  (Read 51 times)

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Offline LEGSY

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Lovely Mdina? iridescent turned over rim bowl.
« on: August 10, 2018, 02:01:32 PM »
Got this little piece today but it has me stumped on age as i have not seen the unusual red iridescence on the revers before almost like carnival glass, I guess it's just a design floor maybe as there are a couple of patches of scuffing near it maybe they tried to remove it after being made. Would love to know the general age and id Michael Harris would still have been there when it was made please. Thank you for looking.
Size 7.5" x 1.5"

Offline chopin-liszt

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Re: Lovely Mdina? iridescent turned over rim bowl.
« Reply #1 on: August 10, 2018, 02:46:52 PM »
An everted rim bowl, these are early, and quite possibly from the MH period, they're not common.
I think the red appearing is a result of the way different colours of glass, in layers over each other, permits light to get through the piece. On the other hand, it might be slightly oxidised silver sitting on the surface, or something to do with a combination of those things. I don't think there is actually red in it, although it can be seen and photographed, if you see what I mean? ::)

When you have opaque yellows over blues (or vice versa) the only colour of light that will come through those is red (or, more commonly a slightly dirty purple). The yellow and the blue you actually see is reflected off the surface.
Mixing colours in glass is nothing like mixing colours in paint. ;D
Blue and yellow gives purply reds, not greens.

And the opaqueness of that particular section will matter too.
A very nice find indeed. ;D
I'd love to see and feel it in reality, just to find out where and how the red arises.
Cheers, Sue (M)
"The really smart people know enough to know that there's too much that they don't know for them to be arrogant about the little they do know."
Prof. Ron Davis OMF

Offline LEGSY

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Re: Lovely Mdina? iridescent turned over rim bowl.
« Reply #2 on: August 10, 2018, 03:16:31 PM »
 ;D
Thank's Chopin-Listz Always a great reply on Mdina glass i think it's my eye's not the camera i don't know why Mdina glass has to be so different from piece to piece it's unique well made and real quality well under valued and i think quite scarce these days, Amazes me how newer  design's have copied older one's also but they have not got the real studio nature of the glass right in my book and these earlier one's are a bit different!!!
Weird bowl though had a few with oxide's on them like the swirly white whispy trails but this is like gold/amethyst lol lots of colors.
This everted rim bowl Reminds me of a miniature charger i have never owned one and would more than likely break it if i had!

 

Offline chopin-liszt

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Re: Lovely Mdina? iridescent turned over rim bowl.
« Reply #3 on: August 10, 2018, 04:24:09 PM »
I had an unusual early experimental thing, which I later discovered was a zig-zag bowl, without the zig-zags. A half-finished thing. It had weird spotty silver deposits on the outside some not shiney, but a bit rough and greyish. I am sure they're not tin, tin does something differently spotty on the surface. :D
What is going on on your surface in this reminds me of that a bit.

Something else you might notice is that it should be fairly finely blown glass - not the usual thick Mdina at all. So it was made by somebody who was really quite good at it, especially for that time period...  ;)
I don't know for certain who it might have been.
But I am going very green around the edges. ;D

One of the main reasons all bits of Mdina are unique is because they actually made their own colours by adding metals to the batches they melted. They didn't buy ready-made and consistent colours from other sources. So the actual colour could easily vary from one melted pot to the next.

Early on, they also had a lot of trouble sourcing cullet. They ended up using old milk bottles and that was unfortunately, a rather sludgey yellowy green colour rather than a nice clear for casing. They did not have good quality materials to work with, so you have to try to take that into consideration when judging the overall quality of a piece.

I like to compare it to remembering that Rembrant had to make his paints from crude materials too, and I don't dismiss his work not being like modern acrylics!
Cheers, Sue (M)
"The really smart people know enough to know that there's too much that they don't know for them to be arrogant about the little they do know."
Prof. Ron Davis OMF

Offline LEGSY

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Re: Lovely Mdina? iridescent turned over rim bowl.
« Reply #4 on: August 10, 2018, 05:47:02 PM »
 :o
I think you must be able to read mind's when it come's to Mdina Chopin-Listz not an hour ago i and a friend discussed the idea behind the weight of a piece of glass as when researching this bowl came across other similar size bowls which were nearly twice the weight this one is 620grams and dead fine we came to the conclusion that this might have been earlier but were unsure that's why i came here!!! de ja vu  :)
I understand it is hard doing any job after a time and people try to make things easier like with buying in uniform color's and making thing's to specific sizes for sale to help keep up with demand etc etc... i just love things done the old fashioned way. I am also surprised to see green like on half of the rim is that a normal color for Mdina?
Thank you for such a great replies love this site... ;D

Offline chopin-liszt

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Re: Lovely Mdina? iridescent turned over rim bowl.
« Reply #5 on: August 10, 2018, 06:16:44 PM »
Clear greens do appear in Mdina, but they're unusual, and not to be confused with the the later bought-in opaque colours.
It arises when the silver on the surface of one gather reacts in the hot glass in the subsequent, clear casing to create a clear amber colour. This clear amber appears inside the clear casing.  (it must be something to do with precise temperatures that mean it goes clear amber rather than opaque yellow) and that clear amber over teal gives rise to that green.
It's just another of the amazing things that happens when silver metal comes into contact with glass and heat.

Sometimes, you end up with a fabulous sort of electric blue haze inside a thick clear casing - that is from silver metal particles which have not reacted.




Cheers, Sue (M)
"The really smart people know enough to know that there's too much that they don't know for them to be arrogant about the little they do know."
Prof. Ron Davis OMF

 

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