What are these spots?

I ordered a few boxes of vitamin C tablets and left them in the cardboard box in my room… I’ve never really examined all the boxes but recently I noticed that some of them have these black spots on them. I tried to wipe them away with tissue but it’s stuck there. When I touch the surface with my finger it feels a little rough. Is this mould growing or is this just stain from liquid that dried up?

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How do you clean glass cook top?

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How to get rid of this stain on my mini fridge

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How to clean ingrained dirt from quick step laminate flooring?

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Is this colour bleed? Sprayed Shout on a stain and it came out like this.

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How to remove this stain?

I don't know what caused it I already tried baking soda with water and two stain removers. I think it has helped because the stains aren't as redish as before I think the fabric is made out of cotton but I'm not sure. It's a top I bought at Bizzbee Thank you in advance!

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Help me remove stains from leftover fruits that went bad on my chair please

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Any tips on deep cleaning new room? Dusty fan, smell of cats,etc

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A UFO sighting from the year 1088 documented by Chinese polymath and statesman Shen Kuo.

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The frog was flung into the air and captured by a NASA camera during the LADEE shuttle launch in Virginia on September 6, 2013

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