Enable Multiple Undos in Photoshop CC using a Keyboard Shortcut
Photoshop's default to undo a previous action is command+Z (Ctrl+Z on windows). This takes you back one step. If you press it again however, it will redo what you have just done. Frustrating when you need to step backwards more than once, as most people want to do.
All you need to do is change the keyboard shortcut. The default to step backwards more than once is Option+command+Z (Ctrl+Alt+Z). If you're fine with that than you can stop reading now. If you want to change it to command+Z than follow these steps:
1.Open Photoshop and go to Window->Workspace->Keyboard Shortcuts and Menus...
3. Click and delete the shortcut and in the empty box hit command+Z (Ctrl+Z).
This will trigger a warning message that says the shortcut is already in use. Select Accept and Go to Conflict.
You occasionally want to toggle back and forth to see the most recent change so this does come in handy.
6. Select Accept and OK.
You don't need real paint to achieve this effect. Do it in Photoshop!
1. Open a new project and start with a white background.
2. Choose the Mixer Brush tool (under the regular brush tool)
3. Set the mixer brush option to Wet, Heavy Mix
4. I used the Flat fan high bristle count brush (2nd row down, 6th brush over) but any brush will give similar effects. Experiment!
5. Pick any color and start painting. Keep choosing more colors and overlap to mix.
6. Go crazy. The best part about photoshop is that you can't make any irreversible errors 🙂
7. For a final effect, I added a black background layer and set blend to Difference.