That's not really how it works. The sender does the splitting, but he has to send the change somewhere, and customarily it's sent to a new address. The receiv

That's not really how it works. The sender does the splitting, but he has to send the change somewhere, and customarily it's sent to a new address. The receiver doesn't even have to be online, you don't get your change from them, so the only way you'd get blacklisted coins in change is if you already had some blacklisted coins in the inputs you were using to begin with.