ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************

With earth day coming relatively soon, my wife has asked me to do a
plastics recycling demonstration for a local community center. I used to
have a written demonstration for a set of 4 fluids that would do a great
job of separating the six different types of plastics in the recycling
system. If I remember correctly, it called for 10:7 ethanol:water; 1:1
ethanol:water; distilled water; and a salt solution. Does anyone have
any ideas what the salt solution composition was? Was it 10 g salt to
100 ml of water?

Also, does anyone want to swap/suggest/circulate demonstrations on using
science to improve the environment? 

Regards,
Tom.

***********************
Thomas Twardowski
[log in to unmask]

***********************************************************************
More information about the Informal Science Education Network and the
Association of Science-Technology Centers may be found at http://www.astc.org.
To remove your e-mail address from the ISEN-ASTC-L list, send the
message  SIGNOFF ISEN-ASTC-L in the BODY of a message to
[log in to unmask]