Hey! Thought I'd share some prints that I've been messing around with on my Formlabs 1+ printer. The resin I used is Autodesk's PR48 with iron oxide (Fe2O3) particles. I've seen people use liquid dyes, but I was curious if powdered pigments would work as well. I've found this gives a deeper and richer color, and doesn't mess with the optical depth of resin as much as you'd expect.
(If you're in the Bay Area, like I am, Douglas and Sturgess is a great resource for materials and resin components) Making the resin homogeneous required vortexing on a handheld vortexer, shown above. Stirring can also work if you don't have one. The settings I used on my Form were: Standard Clear, 25 um layer thickness. The file I printed is a diagnostic .STL you can download here. Here are the results:
On the top image, the little rod-looking features are 50 to 500 microns in diameter and evaluate XY resolution. The ladders around the perimeter evaluate Z resolution. As you can see, the addition of the iron oxide pigment doesn't inhibit the overall print success, but does eliminate finer feature in Z and almost any overhang capabilities in XY. What do you guys think?