Fountain pens require fountain pen inks. Currently, all of the fountain pen inks we offer are non-waterproof. Technical pens may use waterproof inks, but it’s important that they be intended for technical pen use to avoid unnecessary clogging. Look in the product description to see whether use in technical pens is recommended.
Testing is crucial for any mixed media work, and that includes ink on canvas. Acrylic ink, for example, is extremely well suited to work on acrylic-primed canvas and will be compatible with other acrylic media. Alcohol ink, on the other hand, contains dyes that may bleed up through acrylic layers, so alcohol-based dyes inks should not be used under acrylics.
Alcohol inks are a good choice for glass, including etched glass. Although we do offer Etching Inks, these are intended for use on paper rather than glass, and they may not dry on a non-absorbent substrate.