Lumiere Lusters™ by JetAge Studio are specialty color shifting, heat resistant metal oxide powders and flakes that work glittery magic in lampworked glass, and a multitude of other mediums. These flakes are rated to resist heat up to about 1400F, and don’t have a specific coefficent. Similar to Dichroic Extract powder, they throw off a lot of color-shifting sparkle depending on the angle viewed. The larger particle sizes create a lot of shine that you cannot get from micas, and give quite a different effect from powdered extract. They’re also a great cost effective alternative to dichroic coatings and are more heat tolerant than regular powdered micas.