1. We have a wall consisting of two different materials. All blocks are painted, but we want to remove the color

2. Enable the F8-2 tool and select all blocks

3. Open the building menu and select "Change Texture" (1st option)

4. (OPTIONAL) If you only want to change the color of a particular texture, select a filter texture on the left side. In our case, we only want to change the left texture (id 239)

5. Now the relevant part: Right-click on the small color knob in the lower left corner of the right texture preview. Unfortunately the game provides no feedback about that, you will only hear a "click"

6. Hit "Ok" to perform the changes. The color should now be gone. If you want to change the color of ALL elements in your selection, just ignore step 4 (i.e make sure "<All Textures>" is selected on the left side)
