Universal Rapidograph Waterproof Ink (Brown)

I tried the Koh-I-Noor " Trans.Mix Media ink & they ruined my expensive pen tips & even worse, froze the whole pen... the pen to body, body to colored ring, sometimes the cap also .... ALL FROZE TOGETHER & IMPOSSIBLE TO SEPARATE !!! I have Koh-I-Noor concentrated cleaner that I soaked them in, and couldn't separate .... tried my Ultrasonic Cleaner with cleaner with water & could not separate !!! This ink is a dye-based ink & is much less likely to clog your pens !!!

This is not waterproof, at least not the brown one. It melt with watercolor. The color is great but it really bothers me when I need to include colors with my drawing..

Great product and better price