If you want to add some color, gouache can be a great way to make your own colored calligraphy ink!
Gouache and Calligraphy Tutorial
SpiceBox Masterclass: Calligraphy : Arts, Crafts & Sewing
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Make Your Own Calligraphy Ink Colors: An Inkxperiment
How to Use Gouache for Calligraphy on Vimeo
Using Gouache to Make Calligraphy Ink
Using Gouache to Make Calligraphy Ink
Calligraphy Clip: Colour mixing in the pen
How to Mix Colorful Calligraphy Inks with Gouache - Pointed Pen Calligraphy
Schmincke Calligraphy Gouache
Intro to Gouache - New Video Series - Strathmore Artist Papers