If we were to burn NH4Cr2O7 with HgSCN in the Dark Ages in Europe and show it to anyone, it is us who would be burning next on a fiery cross of Inquisition. And it’s no wonder, since this experiment produces a truly marvelous result. At first, as you ignite the mixture of NH4Cr2O7 and HgSCN, all you can see is that it is slowly burning with a reddish flame. After a while, however, a crater is formed in the middle of the burning pile, and then, suddenly, tentacle-like appendages start sprouting from the burning mixture. And you can almost hear the scream of the mad occultist – “Come forth, Kraken! Come forth!” But of course, this is simply a chemical reaction that is called the "Pharoah's Serpent". It was also often sold in firework stores until people realized that it was toxic.

Chinese US fashion blogger Jessica Wang poses for photographers upon arrival at the premiere of the film “Aline” at the 74th international film festival, Cannes, southern France, Tuesday, July 13, 2021. (Photo by Sarah Meyssonnier/Reuters)

Fashionista poses for photographers during London Fashion Week in London, Britain on September 13, 2019. (Photo by Henry Nicholls/Reuters)

Portuguese model Sara Sampaio attends the screening of “Elvis” during the 75th annual Cannes film festival at Palais des Festivals on May 25, 2022 in Cannes, France. (Photo by Stephane Cardinale – Corbis/Corbis via Getty Images)

An incredible view of Thunderstorms light up the insides of clouds near a beautiful sky line. This is truly heavenly weather as pictures taken from an airplane cockpit reveal what pilots see from above.

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Sara Sampaio is seen wearing a pink knit sweater and a pink leather skirt during Paris Fashion Week Spring/Summer 2019 on September 24, 2018 in Paris, France. (Photo by Timur Emek/Getty Images)

Brazilian model Sofia Resing arrives for the screening of the film “France” at the 74th edition of the Cannes Film Festival in Cannes, southern France, on July 15, 2021. (Photo by Sarah Meyssonnier/Reuters)