the food allergy network is a good source & they mention that walnut shells in exhibits do pose a problem for kids with tree nut allergies:
http://www.foodallergy.org/school/archive/avoid.html

I found that website from a resource link at UCDavis:
http://www.ucdmc.ucdavis.edu/welcome/features/20080903_food_allergies/index.html

hope that helps.

julia horvath

-----Original Message-----
>From: Amy Perron <[log in to unmask]>
>Sent: Aug 11, 2009 4:08 PM
>To: [log in to unmask]
>Subject: Walnut Shell Grit
>
>All-
>I¹m considering using walnut shell grit opposed to sand/dirt in a mock dig
>exhibit. Does anyone know if this poses a problem with folks allergic to
>nuts?
>
>Thanks
>Amy
>
>
>
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