Writing a seal requires strict conditions to maintain the quality of the writing and its durability over time.
One of the key factors affecting writing quality is the humidity level in the work environment. When the writer writes on a paper that provides direct humidity (such as a paper with a built-in steam system), a controlled environment is created in which the paper and ink maintain their flexibility and uniformity.

Direct moisture prevents the ink from drying too quickly, which reduces the risk of cracking, peeling, or fading of the letters. Additionally, dry parchment can crack or shrink, which can cause the manuscript to be rejected.
On the other hand, controlled humidity helps the ink absorb optimally into the paper, allows for smooth and sharp lines, and makes corrections easier when necessary.

Another advantage is maintaining the writer's working comfort: excessively dry air may cause eye fatigue, irritation of the skin on the hands, and concentration problems, while stable humidity contributes to a pleasant and professional atmosphere throughout the writing hours.

In conclusion, writing a seal on a paper that provides direct moisture ensures a high halachic and aesthetic result, extends the life of the writing, and makes the scribe's work easier both technically and in terms of the quality of the product.