fol. 39v: Apres couche au dos du verre & sur les couleurs une foeille destain blanche Et cela sec tu pourras couvrir de couleur la foeille destain de pour cacher ton secret La foeille destain donne jour aulx couleurs
trans: Next, layer on the back of the glass & over the colors a white tin sheet. And once this is dry, you can cover the tin sheet of with color to hide your secret. The tin sheet gives light to the colors.
I suggest two changes: Next, layer on the back of the glass & over the colors a whitened tin leaf. And once this is dry, you can cover the tin leaf with color to hide your secret. The tin leaf gives light to the colors.
fol. 40r : continuation of this entry needs tin sheet changed to tin leaf also.
Please also search for other instances of foeille destain and change those if needed.
foeille destain is the equivalent of foeille d'or which we have always trans as gold leaf. On 64r_4, foeille destain has been trans as tin leaf
CONFIRMED: tin leaf also change from "whitened" to "white" @thuchacz to do
Done.