Shimai Variant?

One of my Shimai plants bloomed for the first time today.  Only one bloom stalk and only 2 blooms.  I happen to be setting up some tissue cultures today and removed the stalk to propagate.  I should have taken a photo when it was on the plant.  After I pulled the stalk and blooms I took a sheet of paper and photographed the image with the paper as the background.  The bloom came out true to color but the background was less than appealing for me.  As with Shimai, you can observe green stripes on white petals.  But what is different, purple runs through the green stripe and the slight purple edging on Shimai is a bit bolder and noticeable on this bloom.   Concurrent with this bloom was another standard Shimai blooming (nice green stripes only).  So I set that one up in tissue culture also.  Now I have them both in culture.  We will know in about 8-10 months if in fact the above image is a true variant of the color or as I suspect, in some cases, a variant in color is due to environmental factors.  This point opens up an interesting discussion as how much are the characteristics of a bloom impacted by, soil moisture, humidity, light intensity, length of light duration and temperature, specifically in African violets.  I have no answers on this point, just questions.

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