Edit: It turns out that what I have is, according to ShinHan, not strictly watercolor, but "Professional Korean Color', and they suggest using their own 'Painting glue' for mixing colors. They also recommend the color for use on "hanji" Korean Rice paper. So I will proceed carefully. I don't want to risk dipping a $20 Escoda brush into paint that isn't water-soluble, and I still don't know what exactly this stuff is. The ShinHan Custie Service person just identified them as "Professional Korean Colors", and supplied no more information than that. Not an approach that inspires confidence in me.
Edit: It turns out that what I have is, according to ShinHan, not strictly watercolor, but "Professional Korean Color', and they suggest using their own 'Painting glue' for mixing colors. They also recommend the color for use on "hanji" Korean Rice paper. So I will proceed carefully. I don't want to risk dipping a $20 Escoda brush into paint that isn't water-soluble, and I still don't know what exactly this stuff is. The ShinHan Custie Service person just identified them as "Professional Korean Colors", and supplied no more information than that. Not an approach that inspires confidence in me.