Is that the 12 days of Christmas coming on?
Iron (III) thiocyanate (not iron (II) thiocyanate) is often used as ‘fake blood’. In the photo above it’s the dark red compound formed where the colourless potassium thiocyanate and orange iron (III) chloride solutions meet.
Here’s another photo of iron (III) thiocyanate in solution at three different concentrations:
The red colour changes quite a bit!
In my last post I asked what a hygroscopic material was; well it’s one that absorbs water from the atmosphere. It’s a problem if you try to keep a sample of a hygroscopic compound like lithium chloride, LiCl. It always gets wet and starts dissolving in the water it absorbs from the atmosphere. The trick is to keep it in a dessicator.
What is a dessicator?
Oh, and the displacement reaction for the wolf’s head in the last post is:
copper + silver nitrate –> silver + copper nitrate
The crystals you see hanging from the wolf’s jaw are silver crystals and of course, werewolves are supposed to be repelled by silver.
So green Santa it is, sporting a suit the same colour as copper (II) chloride.
Not all copper compounds are green. What colour are copper (II) nitrate and copper (II) sulfate?