Color Formulas (The next four formulas give a basic way to create grey; each girl may have more or less grams of Violet/Blue and Dark Blue/Grey to modify each look.):

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Karen

Formula: 
Full Spectrum 30g 2N + 10g 1N + 10 Volume Color Catalyst (CC)
Enlightener + Crème Booster + 20 Volume CC
40g ØN + 2g FS Light Violet/Blue + 2g Deep  Dark Blue/Grey + DOCT Crème Developer

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Katie

Formula: 
Full Spectrum 30g 2N + 10g 1N + 10 Volume Color Catalyst (CC)
Enlightener + Crème Booster + 20 Volume CC
40g ØN + 2g FS Light Violet/Blue + 2g Deep  Dark Blue/Grey + DOCT Crème Developer

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Kate

Formula:
Full Spectrum 30g 2N + 10g 1N + 10 Volume Color Catalyst (CC)
Enlightener + Crème Booster + 20 Volume CC
40g ØN + 2g FS Light Violet/Blue + 2g Deep Blue/Grey + DOCT Crème Developer

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Khadijah

Formula: 
Full Spectrum 30g 2N + 10g 1N + 10 Volume Color Catalyst (CC)
Enlightener + Crème Booster + 20 Volume CC
40g ØN + 2g FS Light Violet/Blue + 2g Deep Blue/Grey + DOCT Crème Developer

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Baret

Formula:
Full Spectrum 40g 10N + 4g FS Deep Light Yellow/Orange + 20 Volume Color Catalyst
Twilight + 30 Volume CC

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Christine

Formula:
New growth (Full Spectrum) 10/N + 30 Volume CC
Middle panel (FS Deep): 20g 12N + 10g Light Red/Violet + 20 Volume CC
20g 10N + 1g Dark Grey/Blue + 1g Dark Red/Violet + 20 Volume CC

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Julia

Formula: (all Full Spectrum)
Underneath panel: 7 Orange/Red + 20 Volume at new growth, 30 Volume at mid-lengths and ends
Middle panel: Intense 6 Red/Orange + 20 Volume CC
Top panel: 8 Orange/Red + 20 Volume CC

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Margaret

Formula: (Colour Melting)
New growth to mid-lengths: Full Spectrum 40g 4N + FS Deep 3g Dark Orange/Red + 4 g Dark Green/Yellow + 20 Volume CC
Mid-lengths: Full Spectrum Intense 5 Red/Orange + 20 Volume CC
Mid-lengths to ends: Enlightener + 10 Volume CC

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Jenna

Formula: 
Underneath panel: (all Full Spectrum) 40g 4N + 4g Dark Yellow/Orange + 4g Dark Red/Orange + 20 Volume CC
Middle panel: 40g Dark Pure Base + FS Deep 4g Dark Orange/Red + 20 Volume CC alternated with 6 Yellow/Orange + 20 Volume CC
Top panel: 6 Yellow/Orange + 10 Volume CC at new growth + 20 Volume CC at mid-lengths and ends

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Lindsey

Formula: (Colour Melting)
New growth: Intense Full Spectrum 40g Dark Pure Base + FS Deep 2g Light Orange/Yellow + 2g Dark Orange/Red + 20 Volume CC
Mid-lengths to ends underneath: Full Spectrum 40g Light Pure Base + FS Deep 10g Light Orange/Yellow + 6g Full Spectrum Light Orange/Red + 20 Volume CC
Mid-lengths to ends on the top: Full Spectrum 40g Light Pure Base + FS Deep 24g Light Orange/Yellow + 20 Volume CC

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Kylie

Formula:
New growth: Full Spectrum 40g Dark Pure Base + FS Deep 4g Dark Red/Violet + 4g Dark Red/Red + 20 Volume CC
Mid-lengths to ends: Full Spectrum 40g Dark Pure Base + FS Deep 2g Dark Red/Violet + 3g Dark Red/Red + 30 Volume CC

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Breanna

Formula:
Lightened whole head with Enlightener + Crème Booster + 20 Volume CC
Airbrush: Full Spectrum 1N + DOCT Liquid Developer
Airbrush: FS Deep Dark Orange/Red + DOCT Liquid Developer
Airbrush: FS Deep Light Yellow/Orange + DOCT Liquid Developer