The deuterium in powder toy is actually deuterium oxide and deuterium is the second isotope of hydrogen so therefore it would be in the form of a gas. This is not a request for a new element, this is simply an error correction.
@machoguy(View Post) Well there's nothing we can do about it as it would break saves if it suddenly became a gas. The name "Deuterium" in TPT is an arbitary term given to an element that does not resemble it in many ways.