There was an interesting difference in the residues formed from ordinary tapwater and distilled water...the distilled water-residue was more deep yellow, bordering on orange and without any "crystallisations" or what seems as small mold-growths on the residue from the ordinary tap-water-solution...the distilled-water residue consists more of small trapped bubbles, almost like a dried-up orange foam...
Both glasses seen from side...ordinary tapwater-solution-residue to the left, distilled water-solution-residue to the right...

Ordinary tapwater-solution-residue seen from top...

Distilled water-solution-residue seen from top
