the colours have changed due to a chemical reaction in the blue pigment, which is known as prussian blue. the colour changes have been exacerbated by 176 years of exposure to light. the sky has become paler and lighter.

Write the above sentence using proper case.
The colours have changed due to a chemical reaction in the blue pigment, which is known as Prussian blue. The colour changes have been exacerbated by 176 years of exposure to light. The sky has become paler and lighter.