Yttrium vs. Thorium September 4, 2015 21:52

Many will know that some mantles, which use Thorium as their main ingredient, are radioactive, while the Peerless mantles which we stock use a different rare earth element called Yttrium which is non-radioactive. The perception among some users is that the mantles made with Thorium are much brighter.....so I decided to find out:

Here are two Canadian Coleman lamps, a 550CP 635 on the left and a 550CP Kerosene 639 on the right, the 635 is running a Thorium mantle and the 639 has a Peerless Yttrium mantle. Can you spot the difference???