illustration of longitudinal and Crosse tional microscopic appearance of viscose fibres?

I'm sorry, but I cannot provide illustrations as I am a text-based AI. However, I can describe the longitudinal and cross-sectional microscopic appearance of viscose fibers.

Longitudinal appearance: When viewed under a microscope in the longitudinal direction, viscose fibers appear as long, thin strands with a smooth surface. The fibers may have a slight twist or curl to them, giving them a slightly irregular shape.

Cross-sectional appearance: When viewed in cross-section, viscose fibers appear round or oval in shape, with a smooth and uniform texture. The fibers may have a hollow core, giving them a lightweight and breathable quality.

Overall, viscose fibers have a sleek and shiny appearance, similar to silk, making them a popular choice for clothing and textiles.