Blue fire

(Pyrotech.) compositions of various combustible substances, as sulphur, niter, lampblack, etc., the flames of which are colored by various metallic salts, as those of antimony, strontium, barium, etc.

See also: Fire

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Here's this poor old innocent bird o' mine swearing blue fire, and none the wiser, you may lay to that.
Lastly, with a few tumbling clots of blue fire, the night closed in dark again, the wheels of the steamer were heard revolving, and her lights glided smoothly away in the direction of the sea.
First, wear this girdle; then appear Invisible to all are here: The planets seven, the gloomy air, Hell, and the Furies' forked hair, Pluto's blue fire, and Hecat's tree, With magic spells so compass thee, That no eye may thy body see!
His hands were clenched, and the pupils of his eyes were like disks of blue fire. He was trembling all over.
And when, at last, in the pump-and-tub scene, Mrs Grudden lighted the blue fire, and all the unemployed members of the company came in, and tumbled down in various directions--not because that had anything to do with the plot, but in order to finish off with a tableau--the audience (who had by this time increased considerably) gave vent to such a shout of enthusiasm as had not been heard in those walls for many and many a day.
The hulk of an ancient wreck burned with blue fires, in the light of which danced the HULA dancers to the barbaric love-calls of the singers, who chanted to tinkling UKULELES and rumbling tom-toms.
And now, his huge gaunt form more erect than it had been for years, with a glinting of blue fires in his small and close-set eyes, he was lifting his ancient chant again.
A man in the District reported "a huge bright Fireball with bright blue fire falling very close to Capitol Hill at around 11:30 p.m."
The Night King killed Viserion with an ice spear and after resurrecting it, used his blue fire to bring down the Wall.
The organization's officers, with the help of local police and the Red, White and Blue Fire District, then tranquilized the moose.
Creating, JD'S Chili Parlor, Lessi B's Pie Candles, Lisa's Weihnachtsbrotle, Love and Daisies, My Emergency Room 24/7, New Braunfels Conservation Society, Off Rhodes Craft Beer Station, Pavlock's Kitchen & Culinary Goods, Pinks Popcorn, Pops of Whimsy, Preussen Studios, Princess and the Monkey, Staged Rock Jewelry, Texas PO Boy's, The Dream Corner, The Madison Chocolatiers West, The Rusty Remedy, Urban Soap Bar, Uwe's Bakery & Deli, Valeo Chiropractic, Water 2 Wine of New Braunfels, We Be JAM'N, West Custom Knives, Wicked Woods Jewelry, Face painting and Henna tattoos by Blue Fire Designs, Bungee Trampolines and a Rock Climbing Wall by Climb Mt.
Our destination was the Blue Fire Cooking School, at the Outrigger beach resort on the beautiful tropical island of Koh Samui.