Usually, the spices in curry powder are mainly fennel, turmeric, coriander and other spices, which are all dried and ground into powder by plants. None of these things will melt in water; they must be blended with oil.

Remember, no spices, whether curry powder or pepper, can be dissolved like salt and monosodium glutamate.

If you have any questions about curry, just ask me. My family mixes curry by itself, and there are more than 30 kinds of commonly used spices hidden in it.