Gold Leaf 23 & 3/4K

I've made quite some works using golden leaf, but i was commissioned a portrait in witch i shall use for the first time real gold leaf, 23 & 3/4K. The pressure's some, but i think i'll manage, after all it's the same technique only more money involved.

I bought it were i usually buy the golden leaf, at "Francisco Costa & Irmão (Google Maps).

They're 3.1x3.1in (8x8cm) a book with 25 leafs costs 27,50€, but it also depends on the price of gold. The other material to use with gold/golden leaf is mixtion (mordente). This type of glue is to apply to the surface so that after we can lay the leaf, and the one i use is from french makers "Lefranc & Bourgeois", and believe me... it cost a lot, around 60€/l (240€/gal).