scummed
Developed surface layer
Scummed is the past tense of scum, meaning to form or become covered with scum—the film of impurities that rises to the surface of a liquid: The pond had scummed over with algae.
In cooking or brewing, to scum is to remove this layer: She scummed the stock as it simmered.
coated
Movie or coating
- residueMatter left behind
- slimeThick wet gunk
- algaePrimitive aquatic photosynthesizers
- biofilmAdhesive layer of microorganisms
fouling · limescale · sediment · scale · deposit · encrustation · grime · mildew
film
Movie or coating
biofilm · fouling · limescale · sediment · scale · deposit · encrustation · grime · mildew · mold
stagnant
Without movement or progress
dilapidated · decayed · unattended · ignored · untended · unkempt · derelict · fetid · foul · rank
discolored
Changed from original hue
degraded · clouded · filmed · hazed · patina · verdigris · rusted · weathered · aged · spoiled