The alloy depends on the finished color desired, ranging from a delicate red through yellow to pale green. Since these are alloyed with the less malleable silver, they are somewhat thicker and consequently easier to handle than the more nearly pure gold. Gold leaf is available in books of 25 leaves, interleaved with sheets of tissue dusted with chalk to prevent them from sticking together. Some gold leaf is made in double thickness, and is believed to be the equivalent of pre-19th century leaf, as old writings and handling instructions indicate a less fragile and more easily manipulated metal than the modern day product.
Gold leaf is the traditional metal used on books for lettering, edge gilding, and embellishment.
In terms of beauty and durability it has never been equalled by any of the less expensive substitutes that have been available for more than a century.