Quote:
be sure to use Hot water
Hot water would speed things up considerably. However, I respectfully disagree with this suggestion.
In general, I would strongly suggest advise AGAINST using hot water, and not even use warm water (a few exceptions to this when soaking some of the modern US self-adhesives).
Warm water speeds up the gum dissolving process, but also speeds up almost all sort of other dissolving and chemical interactions.
Some cancellation inks may run. Also some red and purple stamp inks may also run (e.g., the purple Edith Wharton stamp from the US).
Any residual chlorine radicals in the water (many places now have higher than normal levels) will become very active in warm water and you may not realize some stamp fading afterwards.
Also, any stamps on red/green colored envelopes may get stained by the envelope. These should be separately soaked, even when using cold water.
A lot of issues, can ruin part of the batch of stamps you are soaking. Therefore, I don't recommend using warm water unless you feel comfortable about the ink resistance to warm water. Admitted, I am a bit picky about this. It only takes one mess up to get real picky.
Just my opinion. Others may very well have a different take, and I'd be interested in reading those opinions/experiences.
On a side note, if you use the catalogs and see the phrase "aniline" ink (e.g., aniline red...) or the term fugitive colors, do not soak these stamps at all. The colors will dissolve and you may end up with a nearly blank piece of paper! These stamps don't appear often, but thought I would mention it.
Have fun soaking!

k