Bottled Thai curry pastes may be green, red, yellow, and other colors and are commonly used in Thailand as a convenient substitute for homemade mixtures. The color of the paste comes from the ingredients; it is not an indicator of heat level. Green curry paste, for example, is made from a pureed or pounded blend of fresh green chiles, lemon grass, galangal, oil, and other seasonings. Red curry paste uses dried red chiles, among other similar ingredients. You can buy prepared curry pastes of all descriptions in Asian markets or online. Refrigerate after opening and use them within 3 months or so.