eddy wrote:
I plan to use some transparent trays for propagating seeds, is this
feasible or will the roots dislike the light ?
and become stunted
(trays are old fruit storage from Sainsburys )

My childhood recollections of growing beans in jam jars so that root
development could be observed, would indicate that it seemed OK. But,
'taint natural.
Anyway, any roots a quarter of an inch back from the transparent sides
of your trays probably won't know any difference.
More power to your re-cycling elbow. ;-)

--
ned