Ultrathin Carbon Film on a Lacey Carbon Support Film: Pure carbon support films with no Formvar backing. This new product has an even thinner carbon film which is mounted on a Lacey carbon film. The carbon support layer lying over the holes is less than 3nm in thickness and is the thinnest support film available. It is particularly useful for high resolution microscopy of low contrast particles and is also ideal for use with the Energy Filtering TEM.