1). Any info in that Vitro book (or other sources) about Parrots? I assume they were made around the time of Tiger Eyes but don't know for sure (my reasoning has to do with incremental evidence, including the presence of lavender -- see below). Anything on Phantoms (1950s?)?
2). When you say "old" All-Reds (meaning pre-1959), do you mean the black band All-Reds? It would make sense that the black band All-Reds, Blackies and Whities were made around the same time -- 1950s?
3). I notice in my collection that lavender was used in Tiger Eye types and 4 vane cats eyes. Yet, I can't find it in All-Reds, Blackies, Whities or 5 vane cats. Granted, my collection is meager. (Six, et al, says they found only one example of a Blackie with lavender -- American Machine-Made Marbles). Do you have any of these marbles with lavender?
Of the basic colors found in Tiger Eyes and Conquerors (yellow, orange, red, lavender, green, light blue, dark blue, green, brown (or is this really a dk shade of orange?) and black -- it seems only lavender is lost (by the 1960s?). Or was it? I wonder if the restrictions on lead crystal glass, metals and uranium (around 1960) is related to the loss of this color from the Vitro palette or if it is just coincidence. What happened to Vitro and Gladding lavender?
Similarly, I have Helmets, Tri-lights, Conquerors and Phantoms that glow under blacklight (presence of Uranium). No TigerEyes, All-Reds, Blackies, Whities, or hybrid Cat Eyes that glow.
On a related topic, I once asked a university professor (chemistry, molecular physics) if it would be possible to discern the chemical composition of certain marbles by crushing them and separating out their chemical compositions (in some cool scientific way). He said, yes. But it would be a very expensive experiment involving complex machinery. Oh well. We'll have to wait until advancements in science allow for a home version! He thought it was intriguing though.
It would be great to get a scientific account (i.e. chemistry) of the change in colors in the 1950s and 1960s due to federal restrictions.
Joe