Silica gel is used as a visual indicator of moisture in the transformer oil. Colour of new silica gel used in transformer is blue. After absorbing moisture they lose the blue colour and finally turn to pink. Colour of silica gel is blue at good condition and it becomes violet then pink as it absorbs moisture. Higher Reusability and Sustainability: One of the best features of orange silica gel is that it can be reused. After it absorbs the excess moisture content, the gel can be regenerated by drying in an oven and used again