Applying sunscreen or lotion protects the skin from harmful ultraviolet rays. reducing the risk of sun exposure-related diseases such as skin cancer. The increasing awareness of these dangers has driven a demand for testing sunscreen formulations. This research utilizes ultraviolet-visible spectroscopy to measure the Sun Protection Factor (SPF) and the UVA/UVB ratio for several differ... https://www.roneverhart.com/2-1-2-x-1-4-x-36-Smooth-Saddle-Threshold-NGP-410-36/