Process that dyes the garment fibers instead of ink sitting on top of the fabric. As the print is cured, the water in the ink evaporates and leaves the pigment behind. The ink is very thin and transparent, so it only works on light colored shirts and exact PMS colors can not be guaranteed. After the garment is washed, you will not be able to feel the print.
Water base ink is prone to fiber fibrillation. Fiber fibrillation is when the fibers in the garment push up though the ink and make the print look like it is washing out. This happens because the ink is not heavy enough to hold the fibers down. Water based printing is more expensive since it has a shelf life and leftover ink can’t be reused.