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Hot Off The Stamp Presses
Buy new issues as they come out at your post office. You will be paying the cheapest price these stamps will ever see -- face value.

15¢ Hot Air Ballooning
air letter sheet cancelled First Day of Issue (1973)
Used 0.30
US ...

Place them, stamp side up, in a few inches of lukewarm water in a shallow bowl (make sure the water is not HOT as it may damage the stamps). Don't soak too many at one time, they should have room to float.

For example, the topic of aviation is quite broad, comprising such subjects as hot-air balloons, gliders, parachutes, blimps, dirigibles, gliders, hang gliders, turbo-prop aircraft, jet aircraft, ultralights, helicopters, autogyros, airports, ...

This can mean something as simple as moving boxes from a hot attic or damp basement to an area less prone to extreme temperature and humidity fluctuations.

Make sure the water is just warm enough. Boiling-hot water can damage your postage stamps.
Soaking same-colored stamps in one bowl reduces the risk of staining. Some stamp inks have the tendency to “bleed' when you soak them.

Use a shallow bowl and fill it with several inches of cool-to-lukewarm water. (Never use hot water.) Float the stamps with the picture side up. Make sure the stamps have room to float and do not stick to one another.

Airmail - The carriage of mail by air. The first regular airmail service began in 1870 in Paris when mail was delivered by hot air balloons.
Airmail Border - Red and blue markings on border cover indicating airmail service.

Tongs - essential tool of the stamp collector for handling stamps carefully as they enable specimens to be handled without danger of soiling and contamination from hot and perspiring fingers (not 'tweezers').
Tongs (flat and pointed) ...

Breath on the stamp with your hot breath and say the word Hah! the same way you would if you were about to clean your eyeglasses. Take the plastic and cover the spot where the hinge was.

Even if you do not live in Canada, you might want to save some stamps from there. Canada is a very large country but it does not have a large number of people living there. It can be very cold in winter and very hot in summer.

One innovative process, invented in Europe about 1905, involved using hot oil to saturate the area of the envelope where the address would appear. The treated area became sufficiently translucent for the address to be readable.

See also: Stamp, Cover, Find, Local, Stamp Collecting