Anonymous DIYers responsible for popularizing Black Widow in the DIY community include Mechman Alternators (US), Wbassett (US) and Custard10 (EU).
[1] The paint mix is made from easily accessible materials and could outperform much more expensive commercial projection screens.
A white screen is more balanced and accurate to the source color when it is close to the international standard illumination conditions (D65).
The recommended paints and their codes are listed: Dulux 'Chic Shadow' can also be used as a substitute for Grey Steel 2 as it is far more available in the UK and has the same NCS.
The formulation is: This formula produces a reasonably dark end result (N7.4 based on the Hometheatreshack forums neutral grey scale).