Yoshihara Yoshindo and early Tsuchioki

Hi all.

I need more info (any kind and language welcomed) about the experiments

Yoshihara Yoshindo has made to re-create Jokoto/early Kamakura Yaki-ire using oil covering the blade

and not the usual Tsuchioki process to create Suguha and Chojimidare.

Comparative discussions between originals and modern ones especially appreciated.

If it has been discussed in any forum you are in, a link would be great.

Thanks for your time.

Edited to add : to clarify a little I'm referring to the Suguha made with oil instead of clay and

Chojimidare supposedly made with *no* insulating materials at all on the blade.