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Conversion Gel is a white gel that enables any surface to have portals placed on them, even if they are not normaly portal-conductive.
According to Cave Johnson, conversion gel is made from ground-up moon rocks, which make a great portal conductor. This is shown when {{Spoiler|Chell fires a portal at the moon near the end of the game, despite the non-flat surface of the moon. Unfortunatley, long-term exposure to $70 million worth of the rocks led to Johnson's poisoning and eventual death.
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