Char Level
Char level describes how deeply the inside of an oak barrel has been burned, graded roughly from #1 (light, about 15 seconds) to #4 (the heavy alligator char, about 55 seconds). It strongly shapes color and flavor.
In short: Char level describes how deeply the inside of an oak barrel has been burned, graded roughly from #1 (light, about 15 seconds) to #4 (the heavy alligator char, about 55 seconds). It strongly shapes color and flavor.
Charring caramelizes wood sugars and creates a layer of active carbon that filters the spirit and adds color, vanilla, and caramel notes. A #4 char is common for bourbon. Because char level affects extraction and the angel's share differently, recording it per barrel helps explain variation across an aging population.
What are the standard char levels?
Coopers grade char by burn time, commonly #1 through #4; a #4, around 55 seconds, is the classic alligator char whose cracked surface deepens extraction. Toast beneath the char adds its own flavor layer.
How does char level change the whiskey?
Heavier char builds a thicker charcoal filter and more exposed red layer, pushing color, caramel, and smoke; lighter char leans subtler. Recording char per barrel lets a blender compare like against like and explain a profile difference with data.
Tracking this in a spreadsheet? Spirit Sight records it where it happens and builds inventory, compliance, and the books from the same entry. See it on a demo.
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