The Binding of Isaac: Rebirth

The Binding of Isaac: Rebirth

Binding of Isaac - Afterbirth+ Workshop
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Remove color change of a character after using pills
Some pills, who give boosts like Tears Up and Health Up change whole character's sprite color. I want to remove that for my mod, but can't find any information regarding customization of pills. All I need is to remove this color effect of already existing pills.
Please, can someone help? Or at least explain how this works and why it cannot be fixed.
Thank you!