VeryOriginalName6789: Very original name by the way. Check their ID by typing elem.DEFAULT_PT_(element here), the element here in pharentises is your element. Then it shows their id, and IDs show when an element was first added. I dont really know how to make this better or add more info, so just research it yourself and maybe you'll find the answer.
how do people check when was an element added
the backroots rules do not say "it has to be able to work in 2010 TPT", they say "no elements from 2010 onwards may in included in the project initially, but reactions that may create newer elements are allowed"
it would not have worked in 2010
BLOOD IS DEAD, STEAM IS FUEL, HEAVEN IS FULL
well, the backroots rules state that you can have reactions that produce such substances.
erm actually this isn't a 2010 bcol maker because bcol didn't exist in 2010 tpt