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“Tempered”, “Roasted”, “baked” or 'cooked' woods are exposed to temperatures of 350° to 425° Fahrenheit (about 180°-220° Celsius). They are "cooked" in a vacuum chamber so that there is no flame or burning. The process is called 'torrefaction'. There are number of positive results with tempered wood including a darker color, greater stability, feel, and tone.
MAPLE Flamed Maple (Acer rubrum) is typically less stable than unfigured maple, but the tempering process makes it far more stable than it is in its untempered state. Birdseye Maple (Acer saccharum) and Rock Maple (a generic term for several Maple species) have about the same strength and hardness and the tempering process only enhances this. The Birdseye figure adds rarity and an exotic character that is essential to most custom instruments.