Add plastic sheets chemical recipe

[mhamsterr]

New ways of getting old materials are cool (and will be much cooler if we will have limited amount of chems at the roundstart)

About the PR

• Added plastic recipe. You can now make your very own plastic sheets by mixing together 5 parts oil, 3 parts ash and 2 parts sulfuric acid and then heating it up to 374k (10u of 'mixture' = 1 plastic sheet).

Media

plasticchemistry.mp4

• I have added screenshots/videos to this PR showcasing its changes ingame, or this PR does not require an ingame showcase

Changelog

🆑 mhamster

• add: Added plastic sheets recipe. Mix together 5u oil, 3u ash and 2u sulfuric acid, heat it up to 374k and receive your homemade plastic sheet.

[0x6273]

Why would oil turn into ash when heated? None of these recipes make sense.

[deltanedas]

it should probably explode rather than turn to ash
isnt there a thing for burning paper to get ash

[mhamsterr]

Why would oil turn into ash when heated? None of these recipes make sense.

Because of tg ss13: https://tgstation13.org/wiki/Guide_to_chemistry#Ash

Actually, i found more interesting solution on paradisestation wiki, but i'm not sure if this can be done without any c# changes:

You can also create it (ash) by heating up Oil to 874K, but if it's 30u of oil or more, this WILL result in a large fire, which if done in chemistry will likely blow the welding tanks and ignite everyone nearby. Burning paper and scooping it up is a much safer method of making ash.

[mhamsterr]

isnt there a thing for burning paper to get ash

i think there isn't yet? (at least i was not able to do it...)

[deltanedas]

#10373 is a derelict that could be revived with reviews addressed

[mhamsterr]

Ash chemical recipe is purged from this pr and moved to #18955