I tried them on the faired spreader bar on a 1/72nd scale Eduard Fokker D.VII I was well along painting. Their instructions say to paint the background white before applying the decals. I didn't understand this until I slid them off the sheet. They are very transparent. After application, the result looked similar to Aviattic's faded lozenge. This wasn't the look I wanted on this particular build, so I removed the decal before it dried. I do intend to build a generic D.VII, probably with green streaked fuselage, and do the wings up in the Quinta lozenge to give it a proper go.
Stuart