Important use of Gorochana is to put on forehead as Tilak.
This Tilak gives positive energy and helps to accomplish the delayed work promptly, removes obstacles from the way and protects from all the bad energies of surroundings.
Can I make tilak and give it to God while worshipping ?
I don't think so. This tilak is used by ourselves only.
It is also assumed a source of valuable medicine. People use it in both ways internally as well as externally in healing of various common diseases.
Additional information (Don't know about it's genuineness):
Gorochana is also used for Vashikaran purpose. It is also used to carry out any work without hurdle, if any work is getting prevented due to some reasons, it is very helpful and works well in that regard , to overcome obstacles and avoid delay in progress and get achievements.
See more information in this link.