The 4 Gospels, leather dyeing, leather on the spines.
The leather (fair goat) is cut to size and pared down to 0.5 mm with the turn ins to 0.4-0.3 mm. The dye stuff is then applied, in this case a spirit dye. The paring is done first as it can stiffen the leather.
The spirit dye is allowed to dry (evaporate) for 24hrs.
The leather on the spines of the $ Gospels. I used a mixture of PVA and paste (50 % of each)