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

Metal will dissolve it-  try some experiments in a closed system to see
what works before you alter the exhibit.


Richard Osborn

Designer/Producer
St.Louis Science Center
(314) 533 8923
mobile 660 2507
[log in to unmask]


                                                                           
             Allan Ayres                                                   
             <[log in to unmask]                                             
             EDU>                                                       To 
             Sent by: Informal         [log in to unmask]     
             Science Education                                          cc 
             Network                                                       
             <ISEN-ASTC-L@HOME                                     Subject 
             .EASE.LSOFT.COM>          Re: rheoscopic fluid problem        
                                                                           
                                                                           
             09/29/06 03:56 PM                                             
                                                                           
                                                                           
             Please respond to                                             
             Informal Science                                              
             Education Network                                             
             <ISEN-ASTC-L@HOME                                             
             .EASE.LSOFT.COM>                                              
                                                                           
                                                                           




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


jeff courtman wrote:

>we've been using rheoscopic fluid from Kalliroscope.  our fluid seems to
>settle out, sometimes in as little as 12 hours. sometimes it will stay in
>solution for several days, unagitated.
>
>we've been told precipitation could be do to water contamination
>(bacterial?).

Do you use the 'Bacterioscopic Stabilizer' that Kalliroscope supplies?

Do you use distilled water?

Is there any exposed metal in your system?  (We were warned that this
would "dissolve" the particles in the rheoscopic fluid -- not sure
why or how, but there it is.)


Our Kalliroscope fluid stays good for six months or more (granted,
that's in a constantly agitated system)... not quite sure what we're
doing that you aren't, but these are the first three ideas off the
top of my head.  Good luck!

--
~~

Allan Ayres
Exhibit Developer
Lawrence Hall of Science
University of California, Berkeley
Berkeley, CA 94720-5200
[log in to unmask]
510-642-1254

***********************************************************************
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]

***********************************************************************
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]