# Burn A blend operation that darkens the foreground layer using the background. ## Overview 1 - (1 - B) / F ## Parameter Types **Burn (float):** |Input |Type | |------------|-----| |`Foreground`|Float| |`Background`|Float| |`Mix` |Float| |Output|Type | |------|-----| |`Out` |Float| **Burn (half):** |Input |Type| |------------|----| |`Foreground`|Half| |`Background`|Half| |`Mix` |Half| |Output|Type| |------|----| |`Out` |Half| **Burn (color3f):** |Input |Type | |------------|-------------| |`Foreground`|Color3| |`Background`|Color3| |`Mix` |Float | |Output|Type | |------|-------------| |`Out` |Color3| **Burn (color4f):** |Input |Type | |------------|-------------| |`Foreground`|Color4| |`Background`|Color4| |`Mix` |Float | |Output|Type | |------|-------------| |`Out` |Color4| ## Parameter descriptions - `Foreground`: The foreground input. Represented by `F` in the mathmatical equation. - `Background`: The background input. Represented by `B` in the mathmatical equation. - `Mix`: The weight of the blend effect. The higher the `Mix`, the greater the intensity of the blend operation, and the more the effect is visually apparent. The default value is `1`. Values outside of the range `0-1` produce an undefined effect outside of the node’s intended function. ## Discussion The `Burn` node darkens each area in the background based on the darkness of the corresponding area in the foreground, represented by the equation `1 - (1 - B) / F`. Below is an example of a node graph that uses the `Burn` node to darken a brick texture:  Use a [`Noise 2D`](/documentation/ShaderGraph/2D-Procedural/Noise-2D) node to generate Perlin noise, and use the output of that texture as the foreground in the `Burn` node. This process darkens the background brick texture according to the procedural pattern. Below, the resulting texture applies to a cube:  --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)