This deck is a trick deck wherein the backs of the cards used have a thick, non-slick surface. The cards are placed back to back in certain pairs. There a few rules in determining these pairs: * 1) Each pair adds up to 13 (9 and 4; 6 and 7; qu... Read more of Invisible Deck at Card Trick.caInformational Site Network Informational
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Iridium Blue








The rare metal iridium affords a blue which is a mixture of the oxide
and the sesquioxide. But being slightly soluble in water and
decolourised by sulphuretted hydrogen, it would not, other
considerations apart, be an acquisition.





Next: Manganese Blue

Previous: Iodine Blue



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