Alan

A very large Ro Purser Flyball: Akro:

Contemps: Gerry Coleman:

Onionskin: Large handmade:

Two shadows: Bill Murray solid jelly cores:

Handmades:

Some handmades: Solid cores:

A huge chunk of Akro cullet:

Ro Purser:

A specific combination of TWO colors is pretty specialized and may make for a quiet thread for a month - kind of like the "gold" thread.

They look to me like patches from a beginning or end of run that are missing a second major color component. Personally I wouldn't give them a seperate name as if they were a discrete production item....they appear to have been discarded because one glass color pot wasn't flowing.

More gold and metallic that I forgot that I had: Lundberg: Hamon:

True gold will be hard to find (IMO). Here is some silver metallic: Josh Simpson:

Mark Matthews:

Your understanding is correct.

Deep red glass was originaly formulated with gold dissolved in an acid. The same was true (IIRC) for pink - just at a lesser amount of gold. Not all reds required the use of gold. I think that the use of gold was discontinued in the 1930s or 40s by using selenium - and later a copper formula... both which were cheaper. U.S. marble manufacturers would have been restricted from using gold during WWII.

Agree with Mike above - pink glass formulas were expensive (and marbles were cheap). Galen's point is also a good one.

Richard Clark makes some very appealing designs. Here is some of his work that I own:

They are micas - made by Bill Murray.

Lundberg Studios Van Gogh Sunset: Lundberg Studios Sea Crest: Lundberg Studios Starry Night: Bill Murray: Bill Murray (purple outer bands and purple dichro on green solid core):

There is no way of knowing the answer to that supposition. If I had to guess - based on the shape of the rollers, the fact that they are smooth and constantly in motion (unlikely to hold metal salts well) - if it were a one-time occurence - probably fewer than 12. If it happened 3-5 times over a year - then 3-5 times that. Then divide by the high percentage that were lost to time and/or discarded and never dug from a dump site. It is really a freak/chance occurence - essentially an unintended and unwanted contamination of a marble whose production design isn't supposed to look like that. Manufacturers were pretty good at culling their production pieces and dumping the rejects.