Beagle Drawn with Yellow Ochre Ink

I found my favorite color of ink to draw with in pen form. Its made by Maped! It's only a little water soluble so it won't mix too much with my watercolor paints and muddy their color. This pen could change my art life! Imagine the possibilities if I invested in 5 or 10 more colors?  

I drew #14 of Socks, the elder beagle with the Maped pen this morning. I had to dump some water into a yogurt container I'd left lying around my kitchen in order to paint  a wash on my ink lines.

Do you need any Maped pens? What color? I think they only cost around 89 cents.