A dissolvable capsule containing liquid milk has been developed as a sustainable way to avoid plastic capsules in the convenience coffee industry. The developers published their work in the Chemical Engineering & Technology journal. They were able to produce a milk capsule using crystallizing eatable substances (such as sucrose and erythritol) out of supersaturated milk. The process involves a saturated solution being put into molds that already contain a seeding particle. A specific cooling process then leads to the formation of hard and stable crystalline coats. In coffee, the crystalline capsule dissolves leaving a high or medium sweetness along with the milk.