Fwd: Delta E 94 formula

• Subject: Fwd: Delta E 94 formula
• From: Ken Fleisher <email@hidden>
• Date: Wed, 19 Jan 2005 13:44:33 -0500
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Does anyone have the formula for delta E 94 that I could use to plug into
Excel?

Subscripts are shown in parentheses:

∆E*(94) = [ ( ∆L* / k(L)S(L) )^2 + ( ∆C*(ab) / k(C)S(C) )^2 + ( ∆H*(ab) / k(H)S(H) )^2 ]^(1/2)

where:
S(L) = 1
S(C) = 1 + 0.045C*(ab)
S(H) = 1 + 0.015C*(ab)
k(L) = k(C) = k(H) = 1 (for reference conditions)
C*(ab) - C*(ab, standard) OR [ C*(ab,1)C*(ab,2) ]^(1/2)

Ken

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