I want to know the answer to the following question:
How was rag paper superior to the early types of paper made using alum?
All the background I'm provided with is that "The cellulose fibres that make up paper are hydrolyzed by acid, and the presence of alum would eventually degrade the fibres until the paper disintegrated in a process that has come to be known as "slow fire".". Is that enough to answer the question?