The premise of the question is slightly misconceived; humans cannot digest cellulose due to the absence of the necessary enzyme, cellulase, which breaks down cellulose into glucose units. Cellulose is a polysaccharide and a major component of the cell walls in plants. It provides structural support to plants but remains indigestible to humans due to our lack of cellulase. However, cellulose plays a crucial role in the human diet as dietary fiber, which aids in digestion by helping to keep the digestive tract flowing, preventing constipation, and maintaining a healthy gut microbiome. While some microbes in the human gut can partially break down cellulose, the process does not contribute significantly to human nutrition. Therefore, although we consume cellulose as part of plant-based foods, it passes through our system largely undigested, acting more as a facilitator for digestion rather than as a direct source of nourishment.

Red inks generally have a higher propensity to stain due to their dye composition and color intensity. Inks are made from dyes or pigments that can adhere to surfaces, such as paper, fabric, or skin. Red inks often use water-soluble dyes, which can easily penetrate and bind with fibers, making them more likely to cause stains. Moreover, the vibrancy of red hues requires a higher concentration of dye, increasing the likelihood of staining. To mitigate this, one can opt for pigment-based red inks, which are less prone to bleeding but offer fade resistance. Always test new inks on inconspicuous areas first, use high-quality paper, and handle red ink pens carefully to avoid smudging and accidental spills.

Polypropylene fabric, known for its durable and resilient properties, notably differs in feel compared to conventional fabrics like cotton or silk. Its inherent texture can be less soft to the touch due to the plastic polymers used in its production. However, the softness level can be enhanced through various textile manufacturing techniques, such as texturizing or blending with softer fibers, making it suitable for different applications ranging from athletic wear to home textiles. Despite not being inherently soft, its lightweight, water-resistant, and hypoallergic nature makes it a versatile choice in the textile industry.