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Dragonfruit stems are scandent (climbing habit), creeping, sprawling or clambering, and branch profusely. There can be four to seven of them, between 5 and 10 m (16 and 33 ft)or longer, with joints from 30 to 120 cm (12 to 47 in) or longer, and 10 to 12 cm (3.9 to 4.7 in) thick; with generally three ribs; margins are corneous (horn-like) with age, and undulate.
Dragon fruit sold in a market in Chiayi, Taiwan. A pitaya (/ p ɪ ˈ t aɪ. ə /) or pitahaya (/ ˌ p ɪ t ə ˈ h aɪ. ə /) is the fruit of several cactus species indigenous to the region of southern Mexico and along the Pacific coasts of Guatemala, Costa Rica, and El Salvador.
The color blue is notoriously difficult to produce in fireworks, as the copper compounds need to be heated at a specific temperature for the optimal shade of blue to be produced. Thus, a deep, rich blue is usually viewed as the mark of an experienced fireworks maker.
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Colored fire is a common pyrotechnic effect used in stage productions, fireworks and by fire performers the world over. Generally, the color of a flame may be red, orange, blue, yellow, or white, and is dominated by blackbody radiation from soot and steam.
Fireworks take many forms to produce four primary effects: noise, light, smoke, and floating materials (confetti most notably). They may be designed to burn with colored flames and sparks including red, orange, yellow, green, blue, purple and silver. They are generally classified by where they perform, either 'ground' or 'aerial'.
Copper – used as a blue colorant with other fuels; Brass – a zinc-copper alloy used in some fireworks formulas, as a blue colorant for its copper content; Tungsten – used to control and slow down burn rates of compositions, also in delay compositions; Zirconium-nickel alloy – used in some military delay compositions
The salute may be fired on the ground (ground salute) or launched from a mortar as a shell (aerial salute). Due to the nature of the effect, large salutes are some of the more hazardous fireworks. Most of the "salutes" are made with flash powder. Flash powder has a fast burn rate, unlike black powder.