Alan

The "purple" is an anemic black patch allowing the white base to show through.

No

If you can't see 'aventurine' with the naked eye in sunlight, it essentially isn't there. You shouldn't need a microscope to see it. The pics are out of focus, but I would look at it with care to ensure it isn't buffed.

I was asking if the glass reaction to UV was that of true Vaseline glass - or a mild reaction (which is not all that uncommon). There are a few Popeyes made with Vaseline glass instead of typical clear.

Is it true Vaseline glass - some mild reaction elsewhere? The former would be cool on a mint example.

Boro artist. The signature is completely illegible.

They seem to have hit with a LOT of light to brighten the pics.

As noted - modern Vacor.

MK on an unintended clear base - probably part of a tank flush. (MK didn't experiment).

Look out your window at the street. See that dark, nondescript car that always seems to be there?

The glass looks newer to me. Wonky, folded pattern.

Two.

Thank you for posting. Mike was kind enough to send me a few from a contest he ran once. They are all of the smaller size. I have always admired his creative thought that imagined them. Alan

Looks like new-ish glass.

Not oxblood.

Need a still photo, no UV. UV doesn't mean anything.

Keep in mind that when a machine made ingot is cut, the cut is not always a clean one. That is because shear dull over usage. A small string of glass can and will stretch a bit from the rollers until it parts. That is where "drizzle" comes from. Its a manufacturing defect. When the hot ingot hit the rollers trailing that string of glass, it starts spinning immediately. After all, that is what the rollers are for. That "string" can immediately form a loop. That loop can be mistaken for a "9". These days - it often is. People go looking for a "9", a "pontil", "aventurine" etc. Looking enough - they will "find" them. Its important to look at the whole marble. Look at the glass and the glass motion. Glass transparency and opacity. Also, its helpful to know how cane-cut marbles are made. And how terms that are commonly used (like "pontil") are actually misused and misunderstood. >99% of all marbles that people refer to a "pontil" never had a punty attached to it. Understanding the process helps accurately identify marbles.

Not. Don't look for them and they won't deceive you.

Is the first one polished?

Well said. Not an auger for me.

Also - two glass marbles create a sharp sound unique to glass. Two acrylics tapped together make a different, duller sound.

Are these acrylic?

It is a small gather from the furnace on the end of a punty, shaped, figure pressed, "gather boy" brings a roughly equal gather to complete the piece. Then the punty is taken to the same seat that cane cut pieces are worked on, trimmed and rounded, then necked-down from the gather.

Sulphides were a modified cane-based technique based on a singe gather of clear formed into a (roughly) half-sphere. The kaolin clay figure was pressed into the hot gather, more clear added to form the basis of a (rough) sphere, then the whole mass was trimmed and rounded to form a sphere. It would have been made in the same studio as cane-cut handmades.