Genuine 1933 and 1934 Goudey cards would not fluoresce when exposed to uv light.
A slight exception might be if the card was soaked or cleaned be a modern cleaner that contains brighteners... some modern laundry detergents have them.
Brighteners started getting added to paper in the late 1940s. If you pick up your black light, turn off the light in a room with books and papers, you can quickly get the concept... old books and old papers won't fluoresce or shine bright violet from the light. New manufactured paper and books will shine bright.
Black light flashlights are inexpensive. Look on Amazon, Target, Walmart, or eBay online. These are an affordable way to avoid expensive mistakes with ball cards, autographed items, and photographs.
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