To dream of something being pure represents your feelings about some area of your life being uncontaminated or perfect. Alternatively, it may reflect innocence or virtue.
Dreaming of something being pure may also reflect an experience in waking life that is exactly the way you wanted it to be. Experiencing no degradation, interruptions, embarrassments, or inconveniences of any kind.
Negatively, dreaming of something being pure may reflect excess, going overboard, or experimentation with something dangerously powerful. Going too far with being perfect.