Putting an item back into a Tombi! save file

A few weeks ago I felt like replaying Tombi! (Tomba! outside Europe), an old game I used to play on a PlayStation as a kid. At some point I reached the objective where you have to use the Blue Powder on a red mushroom, which turns it blue, and then kill the blue mushroom together with a regular red one to get a new mushroom that gives you more power. I was sure the powder was an infinite item, so I used it without a second thought. I tried the trick, but I missed hitting the red mushroom. I moved on to something else and kept making saves as I progressed, without realizing the powder was gone.

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