Which type of icing is classified as the most dangerous?

Clear ice is classified as the most dangerous type of icing. This type of ice forms when supercooled water droplets freeze upon contact with the aircraft's surface, resulting in a smooth, dense layer of ice. The danger of clear ice lies in its weight, which can significantly alter the performance characteristics of an aircraft, including increasing drag and decreasing lift. This makes it particularly hazardous as it can lead to a loss of control during flight. Its transparent appearance also makes it difficult for pilots to detect, thus posing an additional risk. In contrast, other forms of icing, such as rime ice, are generally less dangerous because they do not adhere as strongly and have a rougher, less dense composition.