Grok's thoughts on it, I tend to agree...
For the best lifespan of a silver/black tarp, use it silver side up. The silver side is typically designed to reflect UV rays and heat, which helps protect the tarp material from degradation caused by prolonged sun exposure. This can extend the tarp's durability, especially in harsh weather conditions. The black side, while effective for blocking light or absorbing heat, is less resistant to UV damage over time. Always check the manufacturer's recommendations, as some tarps may have specific coatings or designs that affect this advice.