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Rosenfarbstoffe aus der Sicht eines Chemikers
(1988)  Page(s) 32.  
 
With 'Charleston' (Meilland, 63)...the Red content increases while expanding. A decrease of carotinoids and a new formation of anthocyanins was ascertained here.
(1988)  Page(s) 28.  
 
[Colour description according to the CIELAB colour space (petal inside): L* = Lightness, a* = red-green axis, b* = yellow-blue axis]
'Complicata' (?,?; pink), L3 47-48, a* 57, b* -8 to -7
(1988)  Page(s) 28.  
 
[Colour description according to the CIELAB colour space (petal inside): L* = Lightness, a* = red-green axis, b* = yellow-blue axis]
'Conrad Ferdinand Meyer' (H. Müller, 1899; silvery pink), L* 66, a* 37, b* -8
(1988)  Page(s) 29.  
 
[Colour description according to the CIELAB colour space (petal inside): L* = Lightness, a* = red-green axis, b* = yellow-blue axis]
'Crimson Rambler' (bright carmine), L* 38-39, a* 59-62, b* 0-11
(1988)  Page(s) 74-75.  
 
Surprising is the clear Peonin content of ...Crimson Rambler,....
(1988)  Page(s) 29.  
 
[Colour description according to the CIELAB colour space (petal inside): L* = Lightness, a* = red-green axis, b* = yellow-blue axis]
'Portland' (= 'Duchess of Portland' 1800; bright scarlet-red), L* 44-45, a* 62-63, b* -2 to +1
(1988)  Page(s) 23-24.  
 
[Colour description according to the CIELAB colour space (petal inside): L* = Lightness, a* = red-green axis, b* = yellow-blue axis]
'Edelweiss' (Poulsen, 69; cream-white), L* 90-92, a* -4 to -1, b* 7-15

...the cream tinge of 'Edelweiss' is easily recognized by the higher Yellow component.
(1988)  Page(s) 62.  
 
...The shrub rose Fortune's Double Yellow' which also originated in China shows a lot of yellow in her blooms, shaded with a tomato-red. As Anthocyanides again Cyanin and Chrysanthemin were found. Carotinoids are well represented with 56 mg%. Among them Betacarotine is now conspicious (approx. 70% of the total carotinoids); the following [synthesis] steps are also taken, but so slowly, that Betacarotine could accumulate. 'Fortune's Double Yellow' has accordingly attained an advanced stage of Carotinoid biosynthesis; as the ability to cyclise results also in an increase of the stability of carotinoids. It is a pity that this rose was not used then for breeding, as it would have certainly resulted in novel coloured descendants...
(1988)  Page(s) 74-75.  
 
Surprising is the clear Peonin content of 'Fortune's Double Yellow', Crimson Rambler,....
(1988)  Page(s) 66.  
 
...Somewhat out of the frame is François Juranville...'François' descends from, if the parentage information is correct, from a cross of R. wichuraiana with the China rose 'Mme. Laurette Messimy' (Guillot, 1887), whose salmon-pink bloom colour is found again, though modified, in the salmon to coral-pink blooms of 'François'. From this, and from the yellow undertones it is easy to deduce the existence of carotenoids and anthocyanides. Indeed, we have found here a mixture of cyanine and chrysanthemine, with a majority of chrysanthemine. The carotenoid content is relatively small with 10% mg. The share of carotenoids of stages II and III is again high. Roughly 50% consists of betacarotene. Also carotenoids of the following stages can be detected, with approx. 40% epoxydes. 'François Juranville' was commercialized in 1908, i.e. after the emergence of 'Soleil d'Or', and should not be influenced by the latter's characteristics, if the information on the parentage is correct. The carotenoid-analysis shows however, that contrary to the other yellow roses with China influence, it can already form significant amounts of epoxydes.
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