Gerard, There is this : http://www.scialert.net/fulltext/?doi=jps.2016.31.37
this, http://www.flowersofindia.net/catalog/slides/Snow%20Columbine.htmland this painting from the RHS website by Niki Simpson https://www.rhs.org.uk/education-learning/libraries-at-rhs/articles/from-petal-to-pigment
M. Young
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