In some cases, when you take a pictures of the blue sky with white clouds, you want to have more contrast. There is a solution to this — red filter with black and white film. This will make the sky more dramatic.
When I look at the sky, what I like the most is the contrast between the blue sky and the white clouds. With colour film rolls there is no problem. But for black and white photography, I’m not always happy with the results. Then I used a red filter. The filter made the sky darker and the clouds whiter. You can come up with amazing photos with high contrast. Enjoy your dramatic sky!