compoundchem: It’s Bunsen Burner Day! More about the Bunsen burner’s history here: http://wp.me/p4aPLT-1KS
tags: ciel62,
from: https://ciel62.tumblr.com/post/142058218936
tags: ciel62,
from: https://ciel62.tumblr.com/post/142058218936