Why effect colors are the quality test
Any factory can make a flat black. Pearl and metallic shades expose manufacturing discipline, because the effect depends on pigment particle size, orientation and loading being identical batch after batch. Inconsistent flop or sparkle between batches is the fastest way to lose body-shop trust.
What to evaluate on a sample panel
Spray the shade over black and over white to judge hiding and travel; view it at three angles for flop; and compare two batches side by side if the supplier can provide them. Check how many coats reach full effect and whether the shade needs a control coat to avoid mottling.
Pearl families worth stocking
Beyond standard silvers, the growth segments are interference pearls (violet, green, gold-brown shifts) and fine crystal pearls for custom and motorcycle work. These carry higher margins and differentiate your range from commodity suppliers.
Pairing with clear coat
Effect basecoats are only half the finish: the clear coat above them sets depth and gloss. Match the basecoat with a clear coat from the same system so the final depth of image matches the sample your customer approved.