Thanks everyone.
Matt - what you describe is exactly what I'm experiencing, too. Many of my old signed balls look perfectly fine. The new Manfred balls are consistently showing bleeding in certain parts of the signature, notwithstanding the fact they are all from different batches of balls, and all stored out of light in the exact same way I store all of my baseballs.
I just purchased a box of Staedtlers so I may try that next.
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