the keyingredient is in the large stone building at the very end
open. that's the answer. OPEN.
Carbonated coconut milk, creature bone, and the key ingredient
I'm assuming you mean the key ingredient to make the medicine on Shark Tooth Island. The key ingredient isn't anything specific; it's a sack. You find it in a cave.
look at your translation key while you put in the code. what you're supposed to type is OPEN, but you have symbols, so use the translation key. :)
If your talking about Counterfeit Island then you get the key and go back to the museum on Counterfeit Island
On Shark Tooth Island, the translation key is the missing page atop the ruins. On Nabooti Island, the Sphinx symbols are all matched, not translated. (see related questions)
There is no key card in skullduggery island.
Early Poptropica.
how
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you don't