How crystals grow, marker edition

Image

My daughter received these Crayola Crystal Effects Window Markers™ for Easter.  I’m not sure if they are discontinued because I couldn’t find them on crayola.com other than a reference in a craft project. You write on glass, and they form crystals over a period of a few minutes.  I had my ProScope HR at home to take some microscopic views of salt and some other crystals that we are using for our Minerals unit.  The 8+1 Science website got me thinking about the essence of minerals, which is the interesting arrangements that atoms make.  Of course, I already knew this, but I think I may emphasize this point a little more.  Anyway, back from this digression, I wanted to take a time-lapse video of the crystallization.  It uses humidity from the air, so it might be some sort of deliquescent material, with the crystallization taking place after whatever volatile solvents evaporate?  (Please correct me on this if I’m wrong.)  On my time lapse, the crystallization happened so quickly that one couldn’t see it, so I went with a real-time video.  You can see the part where the crystallization happens below.  It’s still darn fast, but I don’t have the frame rate on this microscope to slow it down.

My next plan is to freeze some water on a glass slide and watch it melt but play it in reverse.

Advertisements

One response to “How crystals grow, marker edition

  1. Pingback: How crystals grow, ice edition | Earth and Not-Earth

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s