Pretty sure they just poured silver nitrate over glass. You can still buy kits to do that to re-silver old mirrors for the original look. From what I can find, the layered ones were older, and they used tin and mercury which made breaking a mirror a rather unlucky event.
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Cake day: June 17th, 2023
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You can see the text on the front of them for what they are for. Blue are regular passports for casual travel. Red are diplomatic passports for high ranking officials. Green are special passports for senators, MPs or government workers on official business. White temporary passports are usually issued abroad where a Canadian citizen has an urgent requirement to travel but doesn’t have a passport for whatever reason.
I think you are right. I keep finding different ways they did it, so sounds like the 1800s was a busy period in the development of mirror technology!