I'll take this.
The Screen app you mention was SM-MM (Silver Metallic-MississippiMud)
Metallic Silver/ MississippiMud screen intructions
That was the DIY screen app that first showed the potential of some degree of ambient light performance due to the use of a reflective substrate. Mirrors came next as "Light Fusion".
The natural progression was to then use a darker surface coating due to the greatly enhanced reflectivity from a Mirror. Silver metallic was added to the MMud. Then came Black Flame...and it's alter ego, Silver Fire. Upgrades to Silver Fire became necessary when larger sized Mirrors became unavailable. Hence all the "Versions" that have come along.
The Silver Fire RGBY mix is a carefully balanced dark...but translucent (highly diluted) additive. The individual components do not so much as "blend" together as the simply combine to exist as separate individual components that while creating a Gray shade, still individually reflect the light of their given color spectrum.
This allows for more gain from a darker mix when also combined with separate Metallic components such as Silver & Pearl and a slight amount of Gold.
Recently some have re-introduced the possibility of using Silver metallic under a Dark Top Coating, but unless that coating is very translucent, it's not really effective at all. a pure white base is just as effective.
In the case of the original SM-MM, the Behr Silver Metallic was rolled on, while the Top Coat was sprayed.
Remember this, the original reason for the SM-MM app was to have the balance between a bright white translucent top coat and the contrast enhancing aspects provided by a Silver metallic undercoat.
Nowadays, one can spray on such a SM undercoat....back then....when diluting paints with water seemed less than desirable, such was not possible using the gooey, thick Silver metallic paints.