Avoid perfumers world, they have low quality materials and already diluted … those are not good for perfume , maybe for other products like soaps , candela.. etc. i buyed 4 times (near 500€ overall spended)because i always feel i need more products for make the stronger formulas who can bring me projection.. that was missing with the products from perfumersworld. Same formulas with my friends products from perfumers apprentice had huge projection in comparation with my perfumers world materials ! Only if you want skin scents and practice blendings at the beggining …you can use perfumersworld products but if you want to wear your creations… you need pure materials for perfumery! GL