Color & Opacity

Opacity	Specifies the opacity of fire. Fire opacity also affects the brightness of the flame. The more glowing particles there are, the more they will obscure the background and the more light will be emitted.
Color Mode	Selects the way the color gradient is defined. Manual Color allows you to specifiy a color gradient directly, while Black Body Color will use a physical model to compute the color.
Fire Color	Available in Manual Color mode. If Manual Color Mode is selected, you specify the color gradient here. Make sure that you use a high dynamic range of colors (intensities larger than 100%) and that the Clamp checkbox is not checked.
Luminance	Available in Manual Color mode. Defines the overall color intensity in Manual Mode.
Edit	Available in Black Body mode. Copy the color gradient from Black Body Mode to the gradient editor in Manual Mode.
Low Temp.	Available in Black Body mode. In Black Body Color Mode, this value gives the color temperature corresponding to an input value of 0 from the simulation channel. It's most intuitive to observe the gradient above to see this parameter's effect.
High Temp.	Available in Black Body mode. In Black Body Color Mode, this value gives the color temperature corresponding to an input value of 1 from the simulation channel. It's most intuitive to observe the gradient above to see this parameter's effect.
White Point	Available in Black Body mode. Fire has an enormous dynamic range. The white point is used to map it to a lower dynamic range used for you renders. It's most intuitive to observe the gradient above to see this parameter's effect.
Damping	Available in Black Body mode. Instead or in addition to adjusting the white point, you can damp the dynamic range using this parameter. The higher the value the darker the colors will be.
Red/Green/Blue	Available in Black Body mode. The Black Body color model is an idealisation of carbon based light emission. In real fires plenty of other chemicals are burnt or created during the reaction. These controls let you change the tint of the fire color to allow for a broader spectrum of colors. For example, you may want to add more red (or remove green and blue instead) to get closer to the look of oilier fires.