Most potions we have already have an opposite effect in existence (strength/weakness, speed/slowness, heal/harm, regenerate/poison), but some of these effects can't be brewed yet, so no real point to having opposites of them quite yet.
Then again, a couple of these effects could make sense, like nightvision -> blindness, or fire resistance -> combustion.
How about graphite instead of carbon? Naturally carbon is a gas (in the normal C2 form), while graphite is solid. Also, you should be able to get it by smelting a diamond (because if you heat up a pure diamond enough, it will turn into carbon (in the form of C2 and quickly reacting with the oxygen to get CO2). Don't ask me why you would do that.
Also, you should be able to craft 1 carbon nanotube (if you replace the coal with graphite) by crafting this: . Carbon nanotubes could be used on a crafted onto tool (making the toolhead out of carbon nanotubes, placing the tool beneath it, and a stick beneath that) to up it one tier (wood becomes stone, stone and gold become iron, iron becomes diamond, diamond becomes titanium carbide tipped-diamond, and titanium carbide tipped-diamond gets 4,092 durability, ability to collect any resource (that can be collected with a titanium carbide-tipped diamond tool of that type), and ability to mine everything 2 times faster than titanium carbide-tipped diamond tools (but not faster than 0.05 seconds).
Also, it should be very rare.
You do realize carbon nanotubes are freaking tiny, a very recent technology, and pretty much impossible to make by hand by every stretch of the imagination?
1. Presentation is actually incredibly important when posting a suggestion. This includes taking the time to write a good presentation text. Not doing so leads to the kind of hostile replies you've been receiving here .
2. Please don't argue with people who reply to you. Suggestions will receive criticism, both constructive and harsh, and you would have been way better off going back to your OP to correct it than getting angry with those who replied to you.
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Or better yet, cash?
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Then again, a couple of these effects could make sense, like nightvision -> blindness, or fire resistance -> combustion.
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Although mine was just crafted with Cooked Steak, Carrot, Potato, and Bucket of Water, which yielded the stew contained in the bucket.
Pro: Gives lots of Hunger points and high Saturation
Con: Doesn't stack, requires bucket.
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