The 4 Types Of Maple Syrup Grades, Explained - Tasting Table
Briefly

Maple syrup has four distinct grades—Golden, Amber, Dark, and Very Dark—each varying in color, flavor, and appropriate culinary uses. Golden is perfect for desserts.
Experts grade maple syrup using a two-part approach based on appearance and density, with a spectrometer measuring light transmission to determine classification.
Read at Tasting Table
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