Changes

== Hot wire test for chlorine ==

== Hot wire test for chlorine ==

Chlorine is a very dangerous gas used in the creation of many plastics (e.g. PVC). These plastics are safe until heated, whereupon they release toxic chlorine gas which is highly poisonous to humans and will severely damage the machine. The laser cutter will easily heat plastics enough to release the gas, so to avoid a rather nasty situation, use the following technique to test an unknown plastic for the presence of chlorine. This is formally known as the [http://en.wikipedia.org/wiki/Beilstein_test Beilstein test].

Chlorine is a very dangerous gas used in the creation of many plastics (e.g. PVC). These plastics are safe until heated, whereupon they release toxic chlorine gas which is highly poisonous to humans and will severely damage the machine. The laser cutter will easily heat plastics enough to release the gas, so to avoid a rather nasty situation, use the following technique to test an unknown plastic for the presence of chlorine. This is formally known as the [http://en.wikipedia.org/wiki/Beilstein_test Beilstein test].

# Heat some copper wire until red-hot (do this for a while to remove any PVC that may be stuck to the wire from the coating).

# Heat some copper wire until red-hot (do this for a while to remove any PVC that may be stuck to the wire from the coating).