To prepare the tanning float, the required amount of chromium salt was dissolved in 5 L of water. Once prepared, the solution was left to stand for one week in order to stabilize it. Once prepared and pH controlled, the tanningfloat was introduced in the stainless steel tank. The stirring paddle was started both to maintain the homogeneity of the solution and to give it a slight mechanical effect. The electrical resistance was started and the thermostat was graduated at 50 C. Finally, the piece of hide was submerged and left in the tanning float for 3 h. Then, the piece of hide was taken out, washed slightly, let inside a plastic bag for a week and dried.