ok, it's official - I was flicking through a report produced by the Rural Industries Research and Development Corporation called Chilli Spice Production In Australia.
it says: "Seed addition diluted the initial colour as also found by Biacs et al. (1989). Therefore, even though the rate of colour loss was slower, as also observed by Okos et al. (1990), the shelf life was actually reduced due to seed addition. While Okos et al. (1990) attributed oxygen exclusion from the flesh by the seed oil as the main factor preventing colour loss, it is more likely that antioxidants in the seed oil are responsible for this phenomenon, especially when considering the seed oil addition experiment below."
so there it is - "Spice colour is stabilised by seed addition, depending on the flesh to seed ratio. However, the colour is also diluted and the shelf life reduced if no other treatment is used. On the other hand if no seed is added yield and pungency is reduced."
I haven't read the entire article, that will have to wait for the weekend
http://www.rirdc.gov.au/reports/AFO/00-33.pdf
EDIT: the first quote is from page 30
it says: "Seed addition diluted the initial colour as also found by Biacs et al. (1989). Therefore, even though the rate of colour loss was slower, as also observed by Okos et al. (1990), the shelf life was actually reduced due to seed addition. While Okos et al. (1990) attributed oxygen exclusion from the flesh by the seed oil as the main factor preventing colour loss, it is more likely that antioxidants in the seed oil are responsible for this phenomenon, especially when considering the seed oil addition experiment below."
so there it is - "Spice colour is stabilised by seed addition, depending on the flesh to seed ratio. However, the colour is also diluted and the shelf life reduced if no other treatment is used. On the other hand if no seed is added yield and pungency is reduced."
I haven't read the entire article, that will have to wait for the weekend
http://www.rirdc.gov.au/reports/AFO/00-33.pdf
EDIT: the first quote is from page 30