To see powder in your dreams, denotes unscrupulous people are dealing with you.
You may detect them through watchfulness.
If you dreamed of spilling powder, or something being crushed into powder, it suggests that you are in a state of mental turmoil due to conflicting advice concerning an important decision.
Get away by yourself and give your instincts a chance to work it out.
If you have any serious doubts about your ability to make the right decision, then get professional advice rather than friendly opinions.