Paper is white because of the bleaching process it undergoes during production. Wood pulp, which is the primary material used to make paper, naturally has a brown or gray color. To make paper white, the wood pulp is bleached using chemicals such as chlorine dioxide or hydrogen peroxide. This bleaching process removes the natural color of the wood pulp, resulting in the white color of the paper. Additionally, the use of optical brightening agents can also enhance the whiteness of paper by reflecting more light and making it appear brighter. **

It depends on the specific use case. Brown paper is often used for packaging and wrapping, as it is more environmentally friendly and recyclable. White paper, on the other hand, is commonly used for printing and writing, as it provides a clean and professional look. Ultimately, the choice between brown and white paper depends on the intended purpose and desired aesthetic. **

Handmade paper can be smoothed by using a variety of methods. One common method is to use a smooth, hard surface such as a glass or marble slab, and gently rub the paper in circular motions to flatten out any wrinkles or bumps. Another method is to use a heated iron on a low setting to press the paper between two sheets of smooth fabric. Additionally, the paper can be placed under a heavy weight for a period of time to help flatten it out. Overall, the key is to apply gentle pressure and heat to the paper to help smooth out any imperfections. **

A rollerball pen or a gel pen would be suitable for rough paper, such as handmade paper. These pens have a smooth ink flow and do not require much pressure to write, which helps prevent damage to the paper fibers. Additionally, rollerball and gel pens typically have a finer tip, which allows for more precise writing on textured surfaces like rough paper. **

A fountain pen with a fine or medium nib is suitable for writing on handmade paper. The smooth flow of ink from a fountain pen will not damage the delicate fibers of the paper. Additionally, the weight of the pen should be considered to ensure it does not tear or damage the paper while writing. Overall, a fountain pen is a great choice for writing on handmade paper due to its gentle touch and elegant writing experience. **

For a handmade book, it is best to use a paper that is durable and can withstand the wear and tear of being handled and turned frequently. A good option would be a high-quality, acid-free paper that is thick enough to prevent bleed-through from ink or other writing materials. Additionally, a paper with a smooth texture would be ideal for writing and drawing, while a slightly textured paper can add a unique aesthetic to the book. Overall, the best paper for a handmade book would be one that is both durable and suitable for the intended use of the book. **

White paper can appear gray in photos due to the way light reflects off its surface. When light hits the paper, it scatters in all directions, and some of it is absorbed by the paper, making it appear darker. Additionally, the camera's exposure settings and the surrounding lighting conditions can also affect how the paper appears in the photo. These factors combined can cause white paper to look gray in photographs. **

To print with white on black paper, you will need a printer that has white ink or toner capabilities. These types of printers are not as common as regular color printers, so you may need to seek out a specialty printing service. Once you have access to a white ink printer, you can simply select the white ink option in your printing settings and print your desired design or text onto the black paper. Keep in mind that the quality and opacity of the white ink may vary depending on the printer and paper type, so it's best to test a small sample before printing a large batch. **