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My
periodic table poster
is now available!
Rock of alum.
This is a hunk of potassium alum, used for many things but sold retail in this form primarily as a deodorant.
Source:
eBay seller saratthasamuccaya
Contributor:
Theodore Gray
Acquired:
8 February, 2009
Text Updated:
8 February, 2009
Price:
$6/pound
Size:
3"
Composition:
K
Al
(
S
O
4
)
2
.
12
H
2
O
