I make Paraffin wax pillar candles using Silicone molds. I am getting white marks on the candles (see pictures). Pre-formulated waxes are not available in my area so I have to use straight Paraffin wax. I use the following formulation: 11% Stearin and 89% Paraffin wax. I have varied my pouring temperature from 90 to 96 degrees Celsius, pre-heated the molds using heat gun, wrapped the molds in aluminum foil but the marks are still there. Thanks in advance for any advice.