we already have glass reinforcing in tpt 
METL is litteraly steel
BRNZ ? metl again?
OBLK would be worlds most boring thing in tpt
why in the world we would need corn starch in tpt
we have sand for dirt

This seems kind of useless, especially oobleck :[]

And it's DEFINITELY not one of my favorites, my favorites would be here and i hope some people would like these ideas: https://powdertoy.co.uk/Discussions/Thread/View.html?Thread=27464

Modern TPT elements need a wide variety of uses and little overlap with existing elements. To me, all these elements seem too similar to another element.

Tempered glass's property of being stronger is already in the game, just expose GLAS to molten SALT. What "weakness around the corners" is a little vague. GLAS that actually shatters like real glass instead of just breaking under pressure would be neat, but it's not worth breaking old saves that use GLAS, nor is it worth a new element. 

How would STEL's properties be any different from TTAN? Both are strong elements that melt at roughly 1400 degrees celcius. If you make it break under pressure, then, that's just BMTL. Solids in TPT don't have any properties like density or tensile strength, so they need to be especially unique compared to liquids, powders, or gases.

What does BRNZ actually do? "Being gold-ish" isn't worthwhile enough, we already have the deco tools for making fancy colors. An alloying mechanic could be interesting, but you didn't add any other elements like COPR or TIN to the suggestion, nor did you propose a mechanic where liquids could be alloyed together to produce different alloys of bronze with different properties.

How would you actually implement OBLK's behavior? How is OBLK any different from PSTE or GEL?

A system of agriculture in TPT would definitely be interesting. I've always been a huge fan of elements like FNGS from the Fan Elements Mod. Having soils that could have different ratios of organic matter to inorganic and particle sizes and such would be interesting. Plants with actual genomes that made them produce different results, and could actually evolve based on environmental pressures would also be cool. None of this is likely to actually become an official TPT feature, but even as a mod it would be neat.

I believe there is a conflict between your opinions and what TPT's general vibe is. A vast majority of the elements on the periodic table are just dull, grey metals with no notable interactions outside of some nuclear reactors or some military aircraft. Nowadays, elements in TPT are held to a much higher standard than they were in 2010. Any element suggestion worth the time writing has many different reactions. Take the newest element in beta, BASE, it has an interesting production chain, tens of reactions that help make other elements renewable, and has a unique corrosion mechanic, while also being a commonly suggested element.

TPT is developed by a volunteer team, and it's free to contribute by anyone. You are welcome to program these elements and submit a pull request if you want to, but none of these suggestions are interesting or unique enough for a developer to work on the idea.

@pacmanfan123 (View Post)

A: Oobleck sounds like pste, which already hardens under pressure.
B: Glas is already weak around corners (as pressure is able to more freely spread, and thus cause a pressure difference that can break it. Also again, glas can be tempered with molten salt immersion, up to almost 16x the pressure resistance.
C: Metal is already very strong, it cant break under pressure. If you mean higher melt point, see ttan, ptnm, or tung (tho thats brittle)
D: Instead of bronze, what if we used a more fancy, even more goldish metal...gold.