The best Copic marker paper depends on the aim of your work, but you should start with bleed proof paper, as it will show you what the pens can do.
Best Copic Marker Paper - Copic Thinking
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Copic Markers – Getting Started with Alcohol Based Inks – Mister New
Paper for Copic markers, Copic Paper Selections - COPIC Official Website
Copic Marker Storage and Organization - Kat's Adventures in Paper Crafting
Realistic Copic marker like brushes - Brushes and Bundles - Krita Artists
COPIC 101: Everything You Need to Know about the World's Best Marker — Nerdophiles
Textures, Color a House
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Best Copic Marker Paper - Copic Thinking
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COPIC Sketch Marker Sets