leaf "shadows

[groshj01 at TIGGER.STCLOUD.MSUS.EDU]

In article <cigHmQy00bk10reFNq at andrew.cmu.edu>, "Wendy A. McCausland" <wm1k+ at andrew.cmu.edu> writes:
>Can anyone tell me what chemical in fallen leaves is responsible for
>leaving the brown shadow on surfaces,  like concrete, where a leaf has
>been laying?
>
>Thanks in advance,
>Wendy McCausland
>wm1k+ at andrew.cmu.edu
	I believe that this is caused by tannins in the leaf. JSG