Lifecolor have released an interesting set of six acrylic colours for creating damp and mould effects. The colours chosen range from dark greenish browns through to bilious light green - just what you need for surfaces where algae is forming.  
 
The set comprises:
UA746 - Lime Green
UA747 - Dirty Green
UA748 - Brown Green
UA749 - Vegetable Origin Damp Green
UA750 - Vegetable Origin Damp Yellow
UA751 - Dark Mold
 
The 22 ml plastic screw top pots are packed in an attractive flip-top box which has multilingual English, French, Italian and German on the bottom.
 
The colours are much thinner than Lifecolor’s standard acrylic paints and will work undiluted with an airbrush or by hand. If you don’t allow them to dry, you can clean either the airbrush or paintbrush with plain water, while isopropyl alcohol shifts dried-on paint. If you want to dilute the colours further, both Lifecolor’s own-brand thinners and Windsor & Newton's Acrylic Flow Improver work well.
 
For the test swatches, I brushed two coats onto plain white paper. This showed the colours to be more akin to washes than conventional paints, and I wouldn’t use them this way for real, because their translucent nature means you can still see brushmarks clearly in the photo. If they used as a wash and were flooded onto an uneven surface, the density would vary naturally around details - and “tide marks” would create interesting and realistic effects. A quick test on paper with an airbrush gave a smooth result and it was easy to get a gradated effect.
 
As the full title suggests, the finish varies between the colours; Lime Green, Dirty Green and  Brown Green dry matt, whereas Vegetable Origin Damp Green, Vegetable Origin Damp Yellow and Dark Mold have a definite sheen (not full gloss).
 

Conclusion

Lifecolor’s “Leaking And Stains” set offers a useful selection gungy colours that should work for depicting mould and algae. They’re probably not the sort of colours you’ll use every day, but will be just the ticket if you’re working on a diorama base where there’s stagnant water, or a tap or gutter has been leaking for years and allowing mould to build up.
 
Please remember, when contacting retailers or manufacturers, to mention that you saw their products highlighted here - on AEROSCALE.