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The Luminance are wax based

The Luminance are wax based (4 types of synthetic waxes are used), and each pigment/color has its own formula or recipe for the amount and type of wax used to insure consistency/uniformity of hardness across all the pencils (equivalent to an 8B pencil for the Luminance and Museum Aquarelle's, and 6B for their Pablo and Supracolor pencils). This information came straight from Caran d'Ache when I spoke to them by phone (August 2018).