Details about the Blend Texture Tool
Blend Texture works similar to how the blend settings in Photoshop work. There are two inputs, Base and Blend where Base would be the first layer and Blend would be the layer on top.
There's a choice of 18 Blend types and 5 Opacity Blend types. There are options for tiling the base and blend textures separately. The blends can be controlled by the "Texture Amount" values. An additional Blue Intensity variable is used for Angle Corrected Normals Blend.