Yes we have.
It is in polish, but you can see first graphene white light.
https://d.tube/#!/v/icobrands/lbqqo5ik
It's nice to see that there are already existing samples. This is much more enjoyable to watch than the promises in the Roadmap in most projects.
Seeing this is indeed convincing, and this is what investors are looking for with real products. TecraCoin has a professional team so that under any circumstances working hard for its progress, we will see what steps are next for the development of TecraCoin.