What is the best way to write a message in snow?

by on September 20, 2012

Q: I’m looking to write a message in the Prague snow, I’ve looked into the practicality of tea lights but it’s unfeasible. It would require too many and there are too many factors going against it. What I’d like to know is what could I use to write a message in snow that burns? I’d like to write ‘Will You Marry Me?’ in fire on the Prague snow. Any suggestions of a chemical, or fuel that would do that without getting me locked up in Guantanamo Bay that would be easily accessible to buy in any European city?