RE: colour changes/differences

There can be significant variations in the appearance of flowers depending  upon the amount of light violet pigment present. Light violet colours are changed by direct  sunlight.  When the sun has  been blocked by cloud cover more of the light violet  pigments will be  present and this  can significantly change the appearance of a flower. This can be seen with flowers such as Immortality which is light lavender when first opened.  This lavender colour can be more pronounced with cloud cover. This will quickly changed with exposure from sunlight to white.  This can also be seen with flowers such as Blue Line which will appear lavender if it has been developing its bud without a lot of direct sunlight present but will be quite white with a lot of sunlight present during bud development. I had a customer question the identity of Blue Line when he  raised it. Upon inquiry I found that they have a lot of cloud cover in the spring during the bud development and when a flower bloomed!
  it appeared much more like the description of Serenity Prayer than Blue Line.  When he  matched these up with another plant  of  Blue Line it was  found that they were exactly the same and the problem was with the cloud cover during development, causing the flower to take on a creamy lavender tone.
This can actually be an advantage in some situations.  I currently have a flower which I'm referring to is a colour changing flower.  Upon first opening it is a lavender colour but the lavender will fade within the day and after two days appears quite rosy in colour. This changing of  colour is so dramatic that  customers continually come up to me and talk about this line of  flowers where the plants are mixed up.  Actually the plants are not mixed up as the  flower does have a distinctive colour change and both phases of the colour are quite attractive.  This light lavender pigment does significantly change with sunlight and does significantly change the colour of the flower looks so it looks like it's two distinctive different plants when it is actually one plant with two distinctive colours phases.
A number of pinks have a light touch of lavender and the sunlight can affect the appearance of these.
Thus the amount of sunlight just before a flower opens and when its open can change the amount of light lavender pigment and change the appearance of the flower. I'm sure that this can also happen with other pigments. 
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Chuck Chapman, Guelph, Ontario, Canada. Zone 4/5
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