Is it safe?

[Matt Legaspi]

Safe, probably. Think of it as a bit of spilled food, it's not toxic or an immediate danger. While it won't cause any harm, it's probably a good idea to change out the paper regardless, just to cultivate good habits. A little bit of old blood shouldn't be bad, but a larger spill over time would be unsanitary, and cleaner is generally better.

Thanks man, I appreciate it