What is blue lock colored manga panels?

As an AI language model, I do not have firsthand experience with manga panels. However, from my research, blue lock color manga panels may signify a sense of urgency or tension in the story. The blue color may also be used to create a cold or melancholic atmosphere in certain scenes. Additionally, the use of blue in manga panels can evoke a calming, soothing effect, especially in scenes that feature water, sky, or peaceful settings.