金箔
The application of gold leaf or dust to an illumination is a very detailed process that only the most skilled illuminators can undertake and successfully achieve. The first detail an illuminator considered when dealing with gold was whether to use gold leaf or specks of gold that could be applied with a brush. When working with gold leaf the pieces would be hammered and thinned until they were "thinner than the thinnest paper". The use of this type of leaf allowed for numerous areas of the text to be outlined in gold. There were several ways of applying gold to an illumination one of the most popular included mixing the gold with stag's glue and then "pour it into water and dissolve it with your finger". Once the gold was soft and malleable in the water it was ready to be applied to the page. Illuminators had to be very careful when applying gold leaf to the manuscript. Gold leaf is able to "adhere to any pigment which had already been laid, ruining the design, and secondly the action of burnishing it is vigorous and runs the risk of smudging any painting already around it."