Drawing using the transparency slider

I realise that I usually draw with the transparency slider set to opaque so I thought I’d do a few experiments varying this setting. At first I worked with the background dark.

But then I decided to cover the whole drawing area with opaque white and use this as a background to draw on, using black in varying degrees of opacity. This little clip shows the various stages in the drawing process.
I used limited colour in the next clip, again drawing over an opaque white background. Then I used the fade slider to successively ‘erase’ the completed drawing and reversed the order of the photos to make the final image magically ‘appear’.