UltrAuFoil® is a holey gold film with a thickness of about 500 Å, that provides an ultrastable gold support for for biological samples in cryo-EM techniques. The movement of frozen specimens during imaging will be significantly reduced leading to better image contrast and finally to better 3D reconstructions with less data^[1].

Reference

[1] Russo et al. (2014) Ultrastable gold substrates for electron cryomicroscopy. Science 346:1377.