Also asked, is it illegal to set off a flare?
the answer appears to be that it is illegal to let off flares unless in distress. while you can come to an agreement with a local harbourmaster/coastguard it doesn't actually make you 100% legal. In practice if you are ashore it's only rockets that can get you into trouble.
Also, what is in a flare? Flares produce their light through the combustion of a pyrotechnic composition. The ingredients are varied, but often based on strontium nitrate, potassium nitrate, or potassium perchlorate and mixed with a fuel such as charcoal, sulfur, sawdust, aluminium, magnesium, or a suitable polymeric resin.
Furthermore, can you hold a flare?
Once flare is ignited, carefully place on the ground (do not drop). Do not hold flare in upright position as molten residue from the combusion process will burn if dripped on hand. We recommend carefully reading all instructions first.
What is a Type A flare?
Type A - Parachute Flare: This is an 'aerial' type flare, which means it works by being fired into the air. Type A flares are most visible at night. Once it's fired, the red flare will reach a height of about 300 m, and will burn for 40 seconds.