This is the shaft assembly of the head section. We believe that “torsion” is important.

Joseph Naomi Yokota

This cello was completed today.

Larsen strings are at the client’s request.

The total weight  /  2567.5g

Joseph Naomi Yokota

The endpin shaft was changed from 47.1g to 157.6g at the request of the client. The tail-gut was also changed to tail-cord.

From now on I will choose the diameter and length of the sound post.  I have prepared six sound post diameters: 9.5mm-10.4mm-10.7mm-11.0mm-11.6mm-11.9mm.

Joseph Naomi Yokota

Varnishing process
Step 24

This fingerboard has already been glued.
The varnishing process will take a few days.

Joseph Naomi Yokota

Varnishing process
Step 19
The varnish process has been extended until this weekend.

Joseph Naomi Yokota

Varnishing process
Step 17
The varnish process will be completed on Wednesday, May 21st.

Joseph Naomi Yokota

Varnishing process
Step 16

Joseph Naomi Yokota

Varnishing process
Step 15

“Iron mordanting”
Iron mordant is a method of dyeing wood black by reacting iron with tannins.
When the iron in the iron mordant solution penetrates the wood, it reacts with the tannins in the wood, gradually changing the color to a dark gray.
When using iron mordant, care must be taken to maintain high “fastness.”
So when dyeing, it is important to use a dark color.

The iron mordant process began yesterday.

Test coating with 5% aqueous iron mordant solution.
After a year and a half, it has become transparent.

After a few years, it was iron mordanted so that it would look like this cello.
Traces of iron mordant create a transparent navy blue image.
GIOVANNI GRANCINO ( 1637-1709 ) Cello, Milan 1690年頃

Joseph Naomi Yokota

Varnishing process
Step 6

The process up to this point is similar for both the modern and old types.

The next step is where there is a big difference between the old and new varnishing.

Joseph Naomi Yokota

Varnishing process
Step 3

I started the varnishing process yesterday.

Joseph Naomi Yokota