I believe that it is the same symptom as the "blue dot" effect in Nixies, you can read about "The Infamous “Blue Dot”:" a bit down on Michael Moorrees webpage: https://threeneurons.wordpress.com/nixie-power-supply/ . I've seen both orange and blue dots on several Nixies. I recently had orange dots with some Z560M nixies and the fix in that clock design was to use resistors across all cathodes and a voltage divider from anode to cathode to set the voltage to a suitable level - check the "Lower Voltage Cathode Drivers:" on the same webpage to see the effect of these "mid-pull" resistors.
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