I'd like to try this activity, but don't have any watch glasses... Anybody have any suggestions for a cheap substitute that could be used for watch glasses?
Tue, 11/27/2012 - 22:22
Hi Kathryn, thanks, those are good ideas. I did like being able to look through the watch glass to see the crystals, so I think I might try the plastic bowls dried under heat lamps.
Tue, 11/27/2012 - 22:22
Hi Kathryn, thanks, those are good ideas. I did like being able to look through the watch glass to see the crystals, so I think I might try the plastic bowls dried under heat lamps.
Wed, 11/28/2012 - 16:15
We think that any type of container (even foil) that is curved will allow you to see rings. Cheap shoyu (soy sauce) dishes would work, but like foil they are not clear. If you want something clear, you might try small pyrex bowls (you'll need to fill them high enough to cover some curved area).
Fri, 02/01/2013 - 11:30
For the past two years I've used evaporating dishes like these: http://www.labdepotinc.com/admin/uploads/p33040_medium.jpg
They are not transparent, but if you use food coloring, the students will be able to see the outlines of the crystals a little better (I don't actually have my students add food coloring, but I noticed this when I made some samples of different kinds of water (simulated brackish and hypersaline) to compare with seawater.
Sat, 02/02/2013 - 16:43
I haven't actually done this yet... ran out of time, but I was thinking about going for the soy sauce dishes as I have a small collection of those at home.
Tue, 11/27/2012 - 11:43
Aloha Anne,
Have you tried this yet? What did you end up using? I see in the binder for Module 2 that aluminum foil trays can work. I will try this or make trays with the Al foil roll from my kitchen. I am also wondering if a plastic bowl cut in the shape of a watch glass will work, esp. a brightly colored one that might accentuate the crystals. Any thoughts? Kathryn