DIY Granddad (w/help)
Join Date: Nov 2002
Location: Byhalia, Mississippi. Waaaay down in the Bottoms
Mentioned: 84 Post(s)
Tagged: 5 Thread(s)
Quoted: 1890 Post(s)
The added White...in the amount specified...does little to lighten the mix beyond what is already is....it's primary purpose is exactly what you guessed, to help mask the individual Mica particles...most specifically the darker Silver metallic, to a greater effect than without.
The greater preponderance of Pearl to Silver has the same intent, only in the case at point, it is the ratio reduction of the darker elements contained within the Silver that accomplishes the goal, and does so without overtly masking / reducing gain.
Sparklies are not nearly the issue to be avoided as is the "Dirty Window" effect caused by the disparity in color between the Pearl's Mica and the Silver's. Also bear in mind that in the case of the Silver, there can be / is instances of Black particles...essentially dark aluminum.
That last element...something that might come as bit of a shock to some, is that aluminum is the primary compound used to coat the Mica. In the case of the differences between "color", it is simply all due to the added Tint.
For some years, Mica was at the center of a huge dispute as to the effectiveness and desirability of it's use, and that of AAA Aluminum. When in actuality, all AAA is is a finely ground Mica coated with a denser coating of....aluminum. In the past, that coating was at a maximum density, as so being affected it's use. Aluminum's properties required Masking then as well, with a dense, color correcting Beige Tint. Once AAA's compound was changed, it essentially just became a weaker, watered down and lighter colored version, one that no longer needed color correction.
The Silver Metallic we suggest nowadays, the RustOleum...it's about 2x darker than the older, Liquitex version, which itself had less Mica in it as well. Once RustOlem came online, the advent of Silver Fire / Black Flame w N/C (No Colorant) became a plausible choice. The darker Gray Base was the advantage...but also the instigator of the "speckled look" (...speckles are not to be confused with sparklies...)
On that last item, Sparklies are something that usually do not present nearly as much dismay as Speckles, nor are they as visible unless viewed while a ultra bright white background is up. Also they are usually only seen when one get up close...within 2-3 feet or less.
We must blame the expectation of perfection on the calls for a DIY Screen that offers up not a single thing to lament. Everyone wants +Gain...High Contrast...perfect Smoothness...no Color Shifting. And of course it all must cost less than nothing in cash or effort.
Hey! We're working on it...continually! Be patient!