Felicia, I'm not sure I understand your question.
I was just about to come and write a note thanking Carole (thanks Carole, those are real gems!) and making an explanation for newbies who might be reading this and maybe don't know about the issues about how deep colors go in NLR's.
Over the course of many years, Peltier made many marbles called "Rainbos". The style changed over the years. In the early days, their boxes said National Line on them, and so we call their earliest Rainbos "National Line Rainbos".
Here's a box Galen likes to show. It says National Rainbo Line, not National Line Rainbo! .. but we call them NLR's. I
think National Line was sort of the brand, and Rainbo was the style name.
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There's a picture here,
Some More Rainbos, No. 6 Pelt NLR Stock Box, with a great view of the contents of the box. This box gives Rainbo as the style name and doesn't say "National Line" on the view showing, but it still says "National". Specifically, "National Toy Marbles".
So, those are the older style rainbos, the NLR's. On the archived copy of
Marble Alan's Peltier Glass Company page, he says that the NLR's were made from about the late 1920's to the late 1930's.
And then Peltier's later rainbos, which we just call plain Rainbos, appear to have been made from about the late thirties, through the 1940's. [Edit: they were made longer than the 40's. At least into the 60's. Maybe longer than that.]
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There has been a sort of rule of thumb in circulation that the ribbons on the older National Line Rainbos stay mostly on the surface, and the ribbons on the newer, plain "Rainbos" run deeper.
But Carole is showing National Line Rainbo halves. And you can see that the ribbons in those run all the way to the middle. The ribbons in the first picture are what you see on the outside surface of the marble.
The second picture is the middle of the marble. The ribbons in the second picture are the same ribbons that you see on the surface. They're thinner, but running so deep that you can still see them in the middle.
So ... we see that things aren't as cut and dried with NLR's as the old rule of thumb says. :-)