In the Buddhist tradition, handwritten scriptures are regarded as a way of practice, which purifies the soul and deepens the understanding and comprehension of Buddhism by copying scriptures. The copied scripture itself has certain religious significance and respect.
In some traditional ideas, it is believed that the scriptures are the embodiment of Buddhism and should be treated with respect and cannot be easily destroyed or burned. There are also views that the scriptures are worn out and cannot be preserved, or burning them can be a way to meet the needs of special religious ceremonies.
Considering burning manuscripts, it is suggested to consult local Buddhist temples or monks first to understand specific religious customs and opinions. You can consider dealing with it in a more respectful and environmentally friendly way, such as putting the scriptures in a clean place or handing them over to a temple. If you really decide to burn it, you should choose a suitable place and way to ensure that the fire can be controlled and avoid pollution to the environment.