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Grey scale recommendations

If shading is necessary in figures, tables or text, choose grey scales carefully so as to be clearly distinguishable from each other. Avoid the use of cross-hatching to produce a grey scale effect because this causes compatibility problems between software.

RGB colour scheme values as used in the IEC Graphic Charter:


15% black - definition

Black 15%


Red 227
Green 228

Blue 229

50% black - definition

Black 50%


Red 156
Green 157

Blue 159

80% black - definition

Black 80%


Red 88
Green 88

Blue 90



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