[lucida] Lucida OT equality symbol looks faint in Adobe Acrobat

Kai von Fintel tex at fintel.mailworks.org
Wed Aug 10 16:19:19 CEST 2022

A pdf produced via XeLaTeX from the following minimal tex file (using 
the lucida-otf support files from CTAN) displays fine in many pdf 
viewers but in Adobe Acrobat the plain = and its italic version show up 
faintly or in outline. I attach a screenshot of how it looks in Acrobat.

This is a mystery to me. Does anybody have an idea of what might be 

— Kai.

plain:  & =\\
textbf: & \textbf{=}\\
textit: & \textit{=}\\
math:   & $=$
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