It depends on the light spectrum. uv and uv-adjacent blue light will cause more fading faster. Also, the some colors are more susceptible to fading than others. Reds and oranges will fade much faster than blues and greens for example.
Pro "card doctoring" tip - you can actually "bleach" a card's borders without using any chemicals and without removing it from its slab if you have a light box with the right light spectrum. You can also reverse toning/foxing by putting said card in a greenhouse full of plants. And no, I'm not joking.
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