What Color Should the Drain Outage Be After Tummy Tuck?

The color is not necessarily used as a good or bad indicator. Generally, the initial drainage is bloody and tends to be thick and dark with a tendency to clot. As the drainage diminishes it goes from dark red to lighter red (Hawaiin punch) to clearer red orange, to a lighter orange yellow and eventually to a clear yellow (serous) fluid. This is typically about the time the drainage dimishes.

It’s normal for patients to have drainage following
abdominoplasty surgery. This drainage is initially bloody. It rapidly
transitions to a watery red kool-aide consistency. Eventually the drainage
becomes clear with a yellow tint.During
the process the volume slowly decreases as well. When the drainage is clear and
below 25cc per 24 hours, the drains can be removed.

Drain output fluid is usually bloody  becoming more serous (yellow)  after a few days. I don't think any specific color of drain output should be concerning; however, thicker/more dense  fluid especially associated with an unpleasant odor would be concerned (no matter what the color).