couldn't you just use the 1,000 square feet to make thousands of platinum coins? each coin would cost less than 25 GP. they really didn't think that through...

Yes you could, but most players aren't going to.

A platinum coin is about one inch long, so that means each coin would be 2.46 inches square. 1,000 X 12 = 12,000 square inches. 12,000 divided by 2.46 is 4878 platinum coins. 

or 48,000 GP. easily enough to get you a guarded mansion. Or you could go further and just make tiny cubes of adamantine that you could sell for a huge amount of money.

Lets assume that a 0.1 cubic inch cube of adamantine costs less than 25 GP. you could make 100,000 of these. That's 10,000 cubic inches of adamantine, or 833 cubic feet. 

That's 400,000 pounds of adamantine, which would be worth 200,000.000 GP. enough for your own kingdom and an army of mercenaries. 

Yes, that is all accurate. It's also noodly as hell. I mean the rule also say "and they sometimes arouse suspicion and skepticism when used in transaction," about platinum and electrum, as they're from fallen empires. 

Again, most players aren't going to do that, it is also up to the discretion of the DM whether those things fly or not. For the platinum coins they may have to make a performance check to see if the coins look right, etc., and moreover up to DM discretion to write around what they create.

As an aside, the adamantium would need a buyer, it's not like "hey I made this now I magically have 200,000,000 GP."

And I'll ask the more important question in relation to this. What's the problem with that? 

As for who would buy it, nations at war would pay half their kingdom for that much adamantine armor. So you just need to start a war.

And that's literally the plotline of Eberron. Nice!

Actually, 1,000 square feet is 144,000 square inches, since 1 foot equals 12 Inches, but 1 square foot equals 144 square Inches. The ammount of Platinum you'd acquire would be 58,536, or 585,360 Gp. Now to subtly get my DM to give our party this without them getting suspicious as to why.... XD

I think you can very easily interpret the description to mean that regardless of what they paint, the paint is incapable of turning into a precious metal or material (or a living material). It can turn into wood, rock, iron, steel, etc. but not gold, silver, platinum, adamantine, or gemstone. If they painted an object that looks like a platinum coin, I would just say they have successfully created an object that looks like a platinum coin or that looks like an adamantine ingot.

And/or if players start painting vast quantities of precious material (or counterfeit precious material), as soon as they start trying to spend it, you now have a fantastic plot point of the party becoming immediately wanted by the authorities or any particularly greedy group who figure out what they have access to. Good luck to them.

Thats just the equivalent of turning the magic item into coins. No worse than selling it.

So, if you painted a computer, what would happen? 

What if you painted an asteroid falling? While in space?

Quote from Fireslayer999 >>

What if you painted an asteroid falling? While in space?

If you were in WDotMM in the Stardock bit and painted an asteroid, could you wipe out the dinosaurs?

 

 You have to paint on a surface, so you'd just paint a big rock on the ground.

https://vm.tiktok.com/ZSJgCwUao/ this guy has done the math on platinum coins painted

.

25gp worth of pc? Fyi 25gp is about $7500 dollars....

I'm going to avoid explaining all the ways a DM could easily shut this down beyond just saying "No" and instead say ya'll are doing this wrong. The obvious use of this is to paint things on people's faces while they are asleep.

I feel like the coin painting thing is a really boring (but profitable) use of such a potentially fun and powerful item.

If you use the same sizing for gp as pp, then platinum is roughly 1.2 inches(30.6mm).100 pieces fits in 1 square foot. 1000ft wide, times 1000ft long, times 100 pieces in a square foot leaves you with 100,000,000 platinum pieces. Or 1,000,000,000gp……per jar.

You could paint the scene on the side of a cliff and include the skyline.......could work?

photoshop but better