If you want to keep homemade spice powder fresh and fragrant for an extended period, you have to store it in the freezer. Store the homemade masala in the freezer in an airtight container or ziplock bag that is clean and dry. Rather than storing huge quantities of vangibath masala powder that would lose their freshness, consider storing a small tight jar in the pantry closet and replenishing it as needed. Make sure the ziplock bag or container is securely sealed to avoid any moisture traps that might ultimately cause the spice blends to go bad.