An important step in the make-up polishing is the unique hazuya finger stone. If used in a correct way, this thin slice of uchigumori koppa can whiten the steel, giving a hamon a unique white look also known as 'keisho'. This modern way of traditional sword polishing is call 'hadori'.
The area of the ha which is not the hamon is polished with the jizuya stone. The unique feature of this stone is that it opens the steel so the aesthetic details such as njie, nioi and hada can show through the polish.
Any other polishing method would cover these features making them invisible.
It is possible to treat this area with nugui oil to darken it. A darker ji increases the contrast between the hamon and ji and can allow the hada to become clearer.