It could be color variations resulting flow & heat history as mentioned by Ed in the second post.
A brief description of lay-up and heatwork (process temp & hold time) would be helpful. Are we looking at a detail of a fused cross section of Butterscotch rod?
Heatwork & flow have stretched the cross section & any initial variation in color has been intensified. It's relatively common for opalescent rods to have a central dot/streak, often darker than the overall color if viewed on end. It typically remains through firings & should be used as a design element if firing rod on end. It's a small amount of transparent that gets drawn in during the forming process.
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