Answered
The smudge tool will blend existing colors. It won't add new ones.
https://helpx.adobe.com/photoshop/using/tool-techniques/smudge-tool.html
Some brush presets are assigned to a specific tool. You will see an icon for the tool in the upper right. To use the Smudge tool with a brush assigned to the Brush tool, for instance, click on the preset while holding down the Cmd+Opt keys (Mac) or Ctrl+Alt keys (Win).
You can also create a New Brush Preset from the Brushes panel menu and either uncheck "Include Tool Settings" or assign the brush to a different tool.
Jane
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