I think I mentioned before how strongly I feel about using archival art materials. I usually use only acid-free, better yet lignin-free, and lightfast art making supplies.
The only exception so far is Akashiya Sai brush pens. These Japanese dye-based coloured pens have synthetic brush ends that are finer and more supple than regular waterbrushes. They are also a dream to work with. They blend with water so easily and the colours are so beautiful, vibrant and transparent. I mentioned them before but I had to bring them up again because they are sooo nice to work with.
If you like watercolour effects in a brush pen and do not need something archival, give these pens a try. You can find them at Jetpens and other online stores like Amazon.
Wishing you a lovely weekend.
P.S. I can never remember how to spell the name of these pens. 😆