Using the Empirical Method to Identify Cairo Blue Swirls

[Plutonianfire]

As per the previous thread on using an empirical approach to identify the maker of a West Virginia blue swirl, it was noted that CAIRO made blue swirls with thin, dark blue wavy lines accompanied by unique small swirl pieces separate from others.  The two photos below are from the Joe Marble web site linked to Marble Connection … and show the characteristic Cairo features.

[Plutonianfire]

Using the criterion of blue swirls with thin, dark blue wavy lines accompanied by unique small swirl pieces separate from the primary swirl lines, the photos below are for two marbles in my collection that meet the Cairo criterion.

[Steph]

The spongy white base glass is another possible Cairo Novelty tell.  However, when I was learning the little bit I know about swirls, it also put Heaton into consideration.  Also, I think of Cairo as tending more often toward simpler swirls so if the ribbon starts picking up a little busy-ness, that also makes me consider an alternative.  So looking at this view my guess would be "Cairo Novelty or Heaton".  

[Nantucketdink]

Here are some factory dug Cairos in blue/white for more chances to compare