I purchases some new pens today. Oil based paint DecoColor pens.
Tried doing whole tile in just color pens and not starting out with black outline.
Love the pens, they glide over the paper so evenly (does have strong odor - use in ventilated area)
Felt at the completion of tile, I needed to add some black to give it some definition.
Even though they say the tips are fine, nothing compares to the Micron pen.