I have quite a few polypropylene art markers. When I started making more serious adult coloring books and my own artwork with them, I loved, loved, really loved them. They are definitely of professional quality with prices to match. I also have some Copic markers and love them too. And I know many will disagree, but I think PP and Copic are pretty much equal in terms of performance and stability. I think your preferences depend on the nature of your artwork and the way you work. And PP is cheaper per marker than Copic but NOT refillable which can make them more expensive than Copic in the long run. Finding your favorite brand can take a lot of experimentation and I also use the cheaper Spectrum Noir and a few others to a lesser extent. I'm getting great results with SN; bright colors, smoothness and fairly good blending BUT they are more prone to running and smudging than PP and Copic. Paper quality also affects performance (generally thicker is better for those unfamiliar with alcohol markers). Deco Pink and Ballet Pink are my two favorite polypropylene colors.
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