Hi guys I am new in perfumery. I bought some oils from a company for example: Patchouli, oud, Amber, rose, black pepper, lemon...etc and this company said they bought it from a French company called givaudan. However, When ever I tried to make a perfume out of them even if it is 30% concentrated it does not project and last as the professional perfume. Recently from my reading I came a cross fragrance oil and that we should not use them when we want to design a perfume. However, I came also a cross what is called a base ( which is a creation that have been made by good perfumers to make it smell like something for example sandalwood) . Now my question is what would be the difference than between fragrance and base oils? Because what I bought also smell like a specific smell. Also if they are the same does it depends on the company that I buy from them the base and could I build up a perfume just from these base oils?