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A few weeks ago I came across this article: http://earthsky.org/...eals-its-secret This fruits with the allegedly deepest and most intense blue fascinated me so much that I've done more research on structural colours in the plant kingdom. The metallic blue colour of the berries from Pollia- species does not came from pigments but is a result of the effects of Bragg reflection caused by helicoidally stacked cellulose microfibrils, like biological nanotechnology. Pollia japonica has the same effect as the described Pollia condensata, but is much more easier to get. P. japonica (duruo, yabumyoga) is also regarded as medicinal plant in Asia for replenishing the kidneys, to treat back pain and injuries from knocks and falls. Pollia japonica- seeds also have this effect: Seed, 24-fold: And some other species also have iridescent blue- structural colours; the most beautiful (mostly ferns and orchids): Anthrophyum sp., Begonia burkillii, B. chlorosticta, B. edulis, B. 'Green Swirl', B. henryi, B. leathermaniae, B. luzhaiensis, B. pavonia, B. pedatifida, B. sizemoreae, Cauliphyllum thalictroides, Delarbrea michieana- fruits, Diplazium crenatoserratum, Elaeocarpus angustifolius, E. grandis- fruits, Elaphoglossum herminieri, E. metallicum, Mapania caudata, Masdevallia caesia, Microsorum siamensis, M. steerei syn. thailandicum, Ophrys speculum- flowers, Ravenala madagascariensis- seeds, Selaginella erythropus, S. eublepharis, S. uncinata, S. wildenowii, Stegolepis hitchcockii, S. ligulata, Strobilanthes dyerianus, Tetraphyllum rotundifoliatum Chamaedorea metallica Strongylodon macrobotrys Beautiful pictures: http://www.flickrive...ol/interesting/ Microsorum steerei syn. thailandicum and Selaginella uncinata are most easy to get, but Selaginella u. only gets the blue shine when its older.