Where can I get real item IDs? (Not UID)

Hi,
I'm working on recipes of Flan's mod.
But the IDs in IC2.cfg isn't working for Flan's mod.

For example:
I:itemDustCopper=29997

Flan's Mod won't recognize "itemDustCopper".


But Forestry works fine.
Flan's mod recognize IDs in base.conf of Forestry.
Like I:ingotCopper=5003
"ingotCopper" works.


Is it because the IDs in IC2.cfg aren't the real IDs?

thanks for replying guys.
I just tried "30253"(29997+256) and "dustCopper".
Unfortunately, Flan's mod still refuse to read these
The recipe involving copper dust still appears to be blank.