Yep...the one and only.
MMud started it all, a mix to compete with and exceed the performance of excessively expensive paint offerings.
The original Mississippi Mud was a 1:1:1 mix.
1 quart Behr Deep Base (1300)
1 quart Behr Ultra Pure White "Ceiling"
1 quarts Behr White Opal Pearlescence (On the "Faux Paint" shelf)
A bit later the Mix was changed into a 1:1:2 version
1 quart of Behr Deep Base (1300)
1 quart of Behr Ultra Pure White
2 quarts of Behr "White Opal" Pearlescence
When I added 4-6 oz of Behr Silver Metallic to that a bit later, it became MMud SE (Silver Edition)
Or...With a pure Behr Silver Metallic undercoat and MMud top coat it became SM-MM (Silver Metallic-Mississippi Mud)
A Silver Metallic undercoating was a daunting effort for most, and in the search for a substitute, good 'ol CMRA suggested and tried a Mirror as a substrate.
Bam. Light Fusion was born. Then MMud SE Light Fusion
A collaboration with PB-Maxxx helped create RS-MaxxMudd on a Mirror which heralded in the first real gains in ambient light resistance in a higher gain painted screen.
Not too awful much longer, while replying to "dare" by someone to create a "Black Screen" akin to Sony's Chroma-Vue, as well as a request from a DIY Projector Forum, I cobbled together the RGB ratios required to create what was known back in 2005 as Black Flame. When combined with a Mirrored substrate, it became Black Flame Light Fusion...the first such dark painted screen to really have substantial ambient light performance while also maintaining a gain level higher than 1.0
Some controversy ensued over the application / approval of a Patent for Black Flame, resulting in a name change to Silver Fire to differentiate between the supposed commercial application / use of the former and the DIY mix of the latter.
All of the above leading to today's advanced mixes, none of which now must depend upon a Mirror (...although for truly dark versions of SF it gets thing completely over the top...)
The closest thing going to your original MMud mix is RS-MaxxMudd LL