Figure 2From: Use of solar energy for biodiesel production and use of biodiesel waste as a green reaction solventClose up view of painted flask. Round bottom flasks were painted black half-way up the flask using VHT® Flame Proof paint, which can withstand intermittent temperatures up to 1093°C. The round bottom flasks were painted black in order to prevent photochemical side reactions and to allow for a more efficient heating process.Back to article page