We recommend dark text base designs because we figured through print tests that silver naturally shines more and when looked from sides, all light colors and details can't be seen properly, but it still could be printed yet.

Please keep in your mind that these are novelty products and although they are very appealing they have shortcomings as any other product. In this case:

their print quality isn't as good as proper polyester sublimation products, and block printed blacks may occur dark navy.

sequins don't align the same way once it's laid the second time and crescent-shaped background color show under the print and it is more evident in block colors.

You can refer to this video: Sequin Video - Google Drive