MaimeriBlu 12ml Single-Pigment Watercolor Paint - Primary Blue - Cyan PB15:3 Professional Watercolor Paint - Lightfast and Transparent Watercolor Paint Tube for Artists
$15.63
This is another one of MaimeriBlu's professional-grade color primaries. Despite its intensity, it does work, and quite well — one just needs to add a few drops at a time when creating greens and purples with magenta and yellow. I do prefer tubes to godets, since they make it easier for me to mix my custom colors.