Do these dry well on glass?

Yes. However, if you really want it to stick on you should spray a clear coat over it.

I noticed the bombay india ink has a slight reflective sheen to it when dry, presumably because of high shellac content. do the tech drawing inks?

No, there is less acrylic in the Tech inks.

What is the difference between the Tech ink and the Bombay ink?

Showing 1-2 of 2 answers Dr. P.H. Martin Tech Drawing Ink is specially formulated for use in fine Technical Drawing Pens, such as Koh-In-Noor, or Rotring, which are prone to clogging when using regular ink formulas. This Tech Drawing Ink can also be used with any other media you would normally use Bombay and other inks.

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🖌️ Elevate your craft with archival brilliance — don’t let your art fade away!

VERSATILE USE - Perfectly formulated for technical, calligraphy, and drawing pens
ARCHIVAL QUALITY - Pigment-based, lightfast ink that stands the test of time
VIBRANT SPECTRUM - 12 brilliant, acid-free colors to elevate every stroke
PRECISION CONTROL - Glass bottles with droppers designed for flawless ink flow
PROUDLY MADE IN USA - Crafted with quality and care for professional creators

Dr. Ph. Martin's TECH Drawing Ink Set includes 12 vibrant, acid-free pigment inks in 1 oz glass bottles with droppers, designed specifically for technical, calligraphy, and drawing pens. These lightfast, archival inks ensure long-lasting, fade-resistant artwork, proudly made in the USA.

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