Re: Spilt Milk

[Paul Parkanzky <parkanz1@msu.edu>]

I'll wager a guess...  Milk sugar (lactose) breaks down into lactic 
acid.  Acids etch concrete.

Paul Parkanzky
Michigan State University
parkanz1@msu.edu

On Mar 26, 2004, at 11:11 PM, john matthews wrote:
>
> OK, here's a head scratcher.
>
> My co-worker tells me he dropped a gallon jug of milk on his driveway 
> last night. Upon returning with the hose to rinse it off he noticed it 
> had stained the concrete white. Any chemists out there care to venture 
> why this is?
>
> John Matthews