schoolgarden advice/asphalt

I need some advice on behalf of a school garden in Washington DC.  The garden 
was started in a former asphalt playground.  The design called for leaving 
strips of blacktop between planting beds (I haven't seen it, just reporting 
what they've told me).  I assume it is to provide walkways.  They tell me 
that the asphalt 'was so hot that it interfered with the wellbeing of the 
plants in the planting areas.

My question -- is there an environmentally safe material that could be used 
to 'paint' the remaining blacktop to cool it?  What color would be best?

Thanks.
Judy Tiger, GROW, Washington, DC 
GROW19@aol.com


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