Alan

It was added for specific effect. Opalescent glass was first formulated by glass makers for molded glass.

There are two basic answers: Opalescent glass is intentionally chemically formulated to achieve the opalescent effect. The chemical approaches to this were varied over time. Various aluminum compounds were normal as were some flourides. The "effect" is caused by visual perception of the diverse optical frequencies that are close to the visual wavelength perception of the human eye.

Ric, I am very sorry for your loss.

It looks right to me.

Its a coreless swirl.

I imagine that they will accept donations for the displays. The public wouldn't know and Akro corkscrew from a Indian - or care.

I can't get enough of them.

What does a water wheel have to do with a glass furnace?

Go in a Rock & Mineral gift shop and watch the parade of people that come in looking for various crystals to heal specific ailments, disease and pains. Its not just one or two people.

Does the Lion have a club?

The brown base Emerald green Ravenswood is a different type from the light brown, light green Ravenswood.

On the subject of "insides" - here is a photo of a broken Akro milky oxblood - exterior and interior. Sorry the focus is off:

Contemporary or reworked.

Mike Cosentino used to make cases like that and sell them at shows. I still have a few (I think they are empty now).

Those aren't jumping out at me as MK. The one on the right looks a bit Pelt-ish.

I think you're onto something!

Out-of-focus pus yellow?

About 15 years late for that party.

I remember when red micas and Sulphides were The Hotness - and few people wanted machine mades.

The bag clip is almost as interesting.... as it suggests a modern production.

You might ask Patricia. I assume that is who you bought it from?

My opinion as a long-term handmade collector and as a person who has cane-cut experience in the studio: Attributing the colors simply to "it was made later" is a conclusion with no real supporting evidence. A marble of that size is not "hard to handle". Its not a marble until it is completely jacked/necked-down and shaped in the cup. Until then - its just part of a cane - which is easily and completely controlled because it is part of the punty. Once one has the experience of properly managing the heat in the cane and motion - its simple. And once it is necked-down enough to be rounded in the cup - there is no need for a metal tool to touch anything but the neck (which ultimately becomes a pontil). At the right temperature - the (usually) cherry wood cup (actually steam) will smooth imperfections - almost always imparting it's own unique style of very slight surface texture. When odd things start showing up in handmades - its good to pause and wonder why. When multiple odd things are seen in one piece - its good to ask why there are a number of odd things going on that are normally not seen in vintage handmades. Those who have handled "not right" handmades for years have learned to trust our eyes, experience and instincts.

I would prefer not to say in open forum.

It has been for sale for a long, long time. My opinion is that it is not right.