I love the burnt sienna color of my Tombow dual tip pen but it is water-soluble, meaning that I can't add watercolor unless I want it to 'bleed'. So following some of Jane Blundell's charts for mixing De Atramentis document inks, I tried mixing a burnt sienna using document red and document black. I think it may need a touch of yellow added, but I don't have a bottle of that.
I recently bought a bottle of the document red from Goulet Pens . . . and as usual, they sent a mini Tootsie Pop with the ink. Here, I tried varying amounts of ink in some empty sample bottles.
I'm also trying out a new Lamy Safari limited edition coral pen. It came with a "M" nib but doesn't yet write smoothly. I've had some Lamy pens in the past that seemed a bit unresponsive at first --- using them over and over eventually breaks them in. Or I can easily replace the nib with one of my extras if this one persists in being stubborn.