Why is fire blue on the bottom carrying the orange on top?

A flame consists of reacting gases and solids emitting visible and infrared light, the frequency spectrum of which depends on the chemical composition of the burning elements and intermediate reaction products.

In many cases, such as the burning of organic matter, for example wood, or the incomplete combustion of gas, incandescent solid particles called soot produce the familiar red-orange glow of 'fire'.

This light has a continuous spectrum. Complete combustion of gas has a dim blue color due to the emission of single-wavelength radiation from various electron transitions in the excited molecules formed in the flame. Usually oxygen is involved, but hydrogen burning in chlorine also produces a flame, producing hydrogen chloride (HCl). Other possible combinations producing flames, amongst many more, are fluorine and hydrogen, and hydrazine and nitrogen tetroxide.

The glow of a flame is complex. Black-body radiation is emitted from soot, gas, and fuel particles, though the soot particles are too small to behave like perfect blackbodies. There is also photon emission by de-excited atoms and molecules in the gases. Much of the radiation is emitted in the visible and infrared bands. The color depends on temperature for the black-body radiation, and on chemical makeup for the emission spectra. The dominant color in a flame changes with temperature. The photo of the forest fire is an excellent example of this variation. Near the ground, where most burning is occurring, the fire is white, the hottest color possible for organic material in general, or yellow. Above the yellow region, the color changes to orange, which is cooler, then red, which is cooler still. Above the red region, combustion no longer occurs, and the uncombusted carbon particles are visible as black smoke.

http://en.wikipedia.org/wiki/Fire

Old Navy Orange Fuschia Stripe Bikini Swimsuit Size XS Top M Bottom Mint $25.00 Time Remaining: 30m Buy It Now for only: $25.00

VICTORIAS SECRET BIKINI BANDEAU TOP Sz LARGE Bottom Sz M Blue ORANGE Swimsuit $9.99 Time Remaining: 35m

NWT NEW TRINA TURK Swimsuit Bikini Palma white orange chain Bottom 6 LOOK $29.99 Time Remaining: 43m Buy It Now for only: $29.99

BITTEN SARAH JESSICA PARKER SIZE TOP M BOTTOM LG BIKINI BATHING SUIT SWIM SUIT $12.99 Time Remaining: 1h 15m

NEW VICTORIAS SECRET CHEEKY DOT HIPKINI BIKINI BOTTOMS SZ M $14.99 Time Remaining: 1h 25m

NWT Roxy 70s Lowrider Tie Side Orange Yellow Pink Bikini Bottoms MSRP 38 $15.99 Time Remaining: 1h 35m Buy It Now for only: $15.99

NWOT ISLAND ESCAPE SWIMWEAR BIKINI BOTTOM SZ 8 listgg74 $6.99 Time Remaining: 1h 38m

NEWPORT NEWS 2 piece swim suit ORANGE RED BLACK french cut bottom NWT size 10 $17.00 Time Remaining: 1h 41m

VITAMIN A orange brown 2pc bikini top bottom sliding triangle animal print 10 L $9.99 (1 Bid) Time Remaining: 1h 51m

Ladies Lands End 2 Piece Swimwear Tankini Bikini Bottoms size 8 $12.50 (2 Bids) Time Remaining: 1h 53m

NWT MICHAEL KORS BIKINI BOTTOM SZ 16 $9.95 Time Remaining: 1h 57m

WOW womens Lands End AquaTerra bikini top bottom Orange Peel Batik size 6 $25.99 Time Remaining: 2h 13m Buy It Now for only: $31.99

Venus size 2 SWIMSUIT BOTTOMS bikini orange white green floral SEXY lined brazil $13.49 Time Remaining: 2h 14m Buy It Now for only: $13.49

Venus size 4 SWIMSUIT BOTTOM bikini tie side black white red orange polka dot $13.49 Time Remaining: 2h 15m Buy It Now for only: $13.49

ESPRIT ORANGE WHITE TIE BIKINI BOTTOM NEW SIZE MEDIUM RETAIL 42 $0.99 Time Remaining: 2h 17m

NWOT Victorias Secret orange small bikini top medium bikini bottoms swimsuit $6.50 (6 Bids) Time Remaining: 2h 29m

Orange Pink Bikini Islander Bottom Sz 14 Joe Boxer Top XL $8.95 Time Remaining: 2h 58m

Womens 16 XL Ralph Lauren Orange Swimsuit Bikini Tankini Bottom Skirt Look $6.36 (3 Bids) Time Remaining: 3h 1m

Womens JOE BOXER Swimsuit Bikini Bottoms JUNIORS MEDIUM NWT BLUE ORANGE $3.00 Time Remaining: 3h 30m

Womens JOE BOXER Swimsuit Bikini Bottoms JUNIORS SMALL NWT BLUE ORANGE $3.00 Time Remaining: 3h 30m

HURLEY 42 WOMEN LARGE 12 14 SWIMSUIT BIKINI BOTTOM PINK GRAY ORANGE NEON 2910 $11.69 Time Remaining: 3h 32m Buy It Now for only: $11.69

NEW ISLAND ESCAPE BIKINI SWIM SUIT BOTTOM ORANGE SIZE 14 $5.00 Time Remaining: 3h 39m Buy It Now for only: $5.00

HURLEY WOMEN 42 LARGE 12 SWIMSUIT BIKINI BOTTOM ORANGE GRAY 2912 $12.59 Time Remaining: 3h 40m Buy It Now for only: $12.59

Size 14 L NEW 75 La Blanca Skirted Bikini Bottom Brown Pink Orange White $14.99 Time Remaining: 3h 44m

NIKE MEDIUM RISE SWIM BOTTOM ORANGE COLOR 600 XS SKTBRDNG STYLE 404431 NWT 40 $19.99 Time Remaining: 3h 44m

NIKE MEDIUM RISE SWIM BOTTOM ORANGE COLOR 600 SZ S SKTBRDNG STYLE 404431 NWT 40 $19.99 Time Remaining: 3h 44m

NWT Hobie XL Hipster Bikini Swim Pant Bottom Brown w Orange Yellow Trim Side Tie $6.99 Time Remaining: 3h 51m

JCREW MELON SPICE POLKA DOTS SEXY SWIMSUIT BOTTOM SMALL $23.99 Time Remaining: 4h 9m Buy It Now for only: $23.99

Old Navy Orange Hipster Bathing Suit Bottoms Womens Size XL Excellent Condition $0.99 Time Remaining: 4h 34m

VICTORIA SECRET ZEBRA BIKINI BOTTOM with NEON ORANGE SIDE RINGS SWIMSUIT M NEW $19.99 Time Remaining: 4h 43m Buy It Now for only: $22.99

womens bikini swimsuit by st johns bay TOP 16 BOTTOM 10 FROM JCPENNEY $9.99 Time Remaining: 4h 45m

NWT Sunsets Separates Mango orange skirted bikini bottom S $11.99 Time Remaining: 5h 1m Buy It Now for only: $11.99

Old Navy Orange Hipster Bikini Bottoms XL Top M In Excellent Condition $0.99 Time Remaining: 5h 16m

NWOT CHRISTINA SWIMWEAR HIGH WAIST BIKINI BOTTOM SZ 8 ORANGE RED PRINT $11.95 Time Remaining: 5h 47m Buy It Now for only: $11.95

NWT 10 Trina Turk Hipster Bikini Bottom Purple White Orange Petals Rosette Swim $20.95 Time Remaining: 5h 49m

Sunsets Kona Reef Mango Bikini Swimsuit NWT Sz D Cup M Bottoms NWT $65.00 Time Remaining: 6h 1m Buy It Now for only: $65.00

Orange Womens Sexy Halter Bandeau Top Thong Bikini Bottom Swimwear Swimsuit $4.25 (6 Bids) Time Remaining: 9h 54m

Orange Womens Sexy Halter Bandeau Top Thong Bikini Bottom Swimwear Swimsuit $7.50 (9 Bids) Time Remaining: 10h 8m

NND WOMEN SWIMSUIT BIKINI BOTTOM WHITE 8 10 MED 119 $11.69 Time Remaining: 11h 32m Buy It Now for only: $11.69

45 2BAMBOO CORAL BIKINI BOTTOM SMALL NWT $17.99 Time Remaining: 11h 43m Buy It Now for only: $17.99

HULA WOMEN SWIMSUIT BIKINI BOTTOM ORANGE SMALL 4 6 117 $5.19 Time Remaining: 12h 32m Buy It Now for only: $5.19

RAISINS 38 WOMEN MED 8 10 SWIMSUIT BIKINI BOTTOM BROWN PINK AQUA ORANGE 2931 $11.69 Time Remaining: 14h 9m Buy It Now for only: $11.69

Op ocean pacific swim bathing suit bikini bottom ties side sz med $0.99 Time Remaining: 14h 38m

HERMANNY BY VIX TUBE CORAL BIKINI BOTTOMS $29.99 Time Remaining: 14h 53m

Victorias secret pink orange floral bikini set Top M Bottoms S NWOT $22.00 Time Remaining: 15h 14m Buy It Now for only: $37.00

WOMEN SM 4 6 SWIMSUIT SKIRT BOTTOM BLACK PINK TAN 2602 $10.39 Time Remaining: 15h 21m Buy It Now for only: $10.39

LADIES SZ 18 BOTTOM BANDEAU TOP BIKINI SWIMWEAR ORANGE BLACK FLOWERS NWT $30.00 Time Remaining: 15h 38m Buy It Now for only: $30.00

Roxy Blue Pink Orange Hipster Bikini Bottoms Juniors M NWT 36 $15.50 Time Remaining: 15h 38m Buy It Now for only: $15.50

Lands End orange bikini bottom size 22W MINT Free Shipping $15.99 Time Remaining: 15h 51m Buy It Now for only: $17.59

NWT Genuine SHOSHANNA multi color hipster swim bikini bottom pant size L $16.50 Time Remaining: 16h 6m Buy It Now for only: $16.50

New Victorias Secret bikini sz XS top S bottoms XS S pink orange tie dye $19.99 (1 Bid) Time Remaining: 16h 9m

HOBIE BIKINI ORANGE BOTTOM SZ M SWIMWEAR $1.99 Time Remaining: 16h 27m Buy It Now for only: $3.99

New Victorias Secret Crochet Bikini Bottom Sz L Large $3.99 Time Remaining: 16h 46m Buy It Now for only: $3.99

SEXY NWT Victoriass Secret Swim Miraculous Halter Top w Matching Bottom $39.99 Time Remaining: 16h 54m

Carve Designs Womens St Barth Bathing Suit Bottom Orange Hibiscus Large $37.83 Time Remaining: 17h 39m Buy It Now for only: $37.83

M PINK BLUE ORANGE ROXY SCOOTER PANT BIKINI SWIMSUIT BOTTOM NWT A4663 $12.95 Time Remaining: 18h 5m

NWT OndadeMar 3PC bikini swimsuit 10 12 orange 2 tops 1 bottom designer high end $84.99 Time Remaining: 18h 20m Buy It Now for only: $84.99

Orange Womens Sexy Halter Bandeau Top Bottom Bikini Underwear Swimwear $2.99 (9 Bids) Time Remaining: 18h 28m

Orange Womens Sexy Halter Bandeau Top Bottom Thong Bikini Bottom Swimwear $1.25 (2 Bids) Time Remaining: 19h 10m

Orange Womens Sexy Halter Bandeau Ruched Top Bottom Bikini Swimwear Swimsuit $2.00 (5 Bids) Time Remaining: 19h 35m

Hot Sexy Orange Halter Bikini Top + Bottom Padded Bra Swimsuit GT09 SZ S M L $8.99 Time Remaining: 20h 42m

Raisins Polka Dot Hamptons Pant w Ruffles Swimsuit Bikini Bottom $9.99 Time Remaining: 20h 48m Buy It Now for only: $9.99

Sexy Orange Triangle Halter Tie Top + Bottom Bikini Set Swimwear wm3048o $0.99 Time Remaining: 21h 46m

Bathing suit bottom size medium juniors oranges no boundries $0.99 Time Remaining: 21h 53m

WOMENS REGULAR FAILLE HIGH RISE SWIMSUIT BOTTOM SZ 16 LANDS END NEW $18.99 Time Remaining: 21h 57m Buy It Now for only: $18.99

NWT COVERUP APPLE BOTTOMS BUBBLE TOP STRAPLESS SIZE L TERRY BRIGHT PINK ORANGE $15.99 Time Remaining: 21h 59m Buy It Now for only: $15.99

Hot Sexy Orange Lace Ruffled Bikini Top Bottom Padded Bra Swimwear GT11 S M L $8.99 Time Remaining: 22h 20m

WOMENS REGULAR HIGH RISE SWIMSUIT BOTTOM W TUMMY CONTROL SZ 10 LANDS END NEW $18.99 Time Remaining: 22h 48m Buy It Now for only: $18.99

NWT Becca by Rebecca Virtue Bikini bottomsSmallYellow Pink Multi54Gorgeous $5.00 Time Remaining: 23h 5m

HOBIE 34 WOMEN XL 16 SWIMSUIT BIKINI BOTTOM PINK BLUE PURPLE ORANGE WHITE 3363 $11.69 Time Remaining: 1d 1m Buy It Now for only: $11.69

Nwot Vix Sophia Mali Bikini Bottom Coral Python Print Large L Ret 92 $26.00 (20 Bids) Time Remaining: 1d 40m

BLUE PURPLE ORANGE GREEN WHITE BUTTON NAUTICAL BOY SHORT BIKINI BOTTOM TOP M $0.99 (1 Bid) Time Remaining: 1d 52m

NEW VICTORIAS SECRET SWIMSUIT TOP BOTTOM MIX MATCH PICK ONE XS S M L $19.99 Time Remaining: 1d 53m Buy It Now for only: $19.99

Summer Set of 2 Roxy Swim Suit Bikini Bottoms Size Med Multi color Orange Pink $2.98 Time Remaining: 1d 1h 4m Buy It Now for only: $19.00

Victorias Secret Sexy String BIKINI Swimsuit Orange Sunset NWT M Top S Bottom $21.95 Time Remaining: 1d 1h 22m

Victorias Secret String Bikini Bottom SizeM ColorNeon Orange Gold design DJ8 $13.98 Time Remaining: 1d 1h 36m Buy It Now for only: $13.98