Dio Lanetzach, in English

TM דיו לנצח  is a pure  דיו עשן   for  סת"ם  which is strictly kosher - מהודר לכתחילה.  It is manufactured in the USA by Torah observant Jews. It is  כשר למהדרין  under the supervision of   OKaf Orthodox Kosher.

To Order Dio Lanetzach Contact


טל. ארה"ב    Tel. USA     +1-570-906-8486

דיו לנצח   is water-resistant, flexible, and break-resistant.  סת"ם  written with  דיו לנצח  are so durable, that, even if we abuse them, they remain kosher. Folds and wrinkles in the קלף and wetting the קלף in water did not damage דיו לנצח.

דיו לנצח  is  certified and recommended by  ועד משמרת סת"ם   and by the world's greatest Rabbis. 
To see the certifications and recommendations click here.

All conventional inks used by  סופרים  today contain  קנקנתום  and  מי עפצים  with acids. The acids burn the  קלף  and cause the ink to flake off when it gets old. This is a Greek ink formula introduced after  חורבן בית שני.  Before the  חורבן, the only ink used by  סופרים  was  דיו עשן. The Dead-Sea scrolls were written with  דיו עשן - an ink which remained black on the  קלף  for 2,000 years. The Greek ink also contains gum. When the gum dries, the ink cracks, breaks, and falls off the  קלף.  Most defects found in non-kosher  סת"ם  today are caused by defects in this brittle Greek ink. 

Comparing the strength of dry ink.
Left: conventional Greek ink - very brittle, easily breaks into splinters.
Right:  דיו לנצח - flexible like rubber, does not break and does not tear.

Water is flowing over a parchment written with  דיו לנצח.
The ink did not dissolve and did not smear.

This parchment was written with  דיו לנצח.  It was soaked with water as shown
in the previous photograph then dried, three times. The ink was not smeared.
The upper left corner and the lower right corner were sharply folded
forwards and backwards, 200 times, and the ink did not crack.

The Greek ink loses its black color over time and turns red. The reason is that the  קנקנתום contains iron. The iron reacts with oxygen in the air and turns into rust.  דיו לנצח, on the other hand, remains black forever. Without  קנקנתום  there is no iron, no rust, and no red color.

It is very difficult to make good ink with  עשן. Therefore, the Greek ink rarely contains it. And, if it does, it contains only minute amounts.  דיו לנצח, on the other hand, is a pure  דיו עשן  with strong flexible adhesives and strengthening materials. The  עשן  ensures that the ink will remain black forever. Since it has no  קנקנתום, it can never fade or turn red like the Greek ink. The flexible adhesives and the strengthening materials help  דיו לנצח  to adhere well to the  קלף  and not break off.  דיו לנצח  adheres to the  קלף  so well that nothing can get it off, except scraping it with a knife
when it is necessary to correct a mistake.

All  פוסקים  agree that only  דיו עשן  is  כשר לכתחילה. The Greek ink with  קנקנתום  is kosher  בדיעבד.  It was permitted also  לכתחילה  because there was no other choice. Most of the ראשונים  prohibit ink which does not contain  עשן.  Some  ראשונים  prohibit ink with  קנקנתום, while others prohibit ink with  מי עפצים. The Greek ink was allowed only because there was no other choice. A good  דיו עשן  was not available. Even those who allowed the Greek ink with  קנקנתום, say that  דיו עשן  is better - למצוה מן המובחר.

Parchments written with  דיו לנצח  were folded back and forth 200 times and the ink was not damaged. They were also immersed in water and the ink was not smeared.  דיו לנצח  is also free from the acids found in the Greek ink. (The Greek ink contains acids - this is why it smells like vinegar. The acids burn the  קלף  and cause the ink to flake off when it gets old.)

סת"ם  written with  דיו לנצח  are intended to stay kosher forever. Because of the flexibility, water-resistance, no acids, and strong adhesion of the ink, they can remain kosher longer than any other  סת"ם  written in the past 2,000 years.

You work hard and take pride in the  סת"ם  you write. Don't you want your  סת"ם  to remain kosher for hundreds, maybe thousands, of years?

How To Use   דיו לנצח

דיו לנצח  flows differently from Greek ink. Changing from one ink to another, always requires some practice and getting used to the different flow of the new ink.

Cut the  קולמוס  in such a way that will match it to the ink flow, to the writing speed, to the tilt angle of the קולמוס  relative to the  קלף, and to the tilt angle of the table relative to the ground. General instructions for cutting a  קולמוס  can be found here [1][2]. After dipping the  קולמוס  in the ink, some Sofrim touch the surface of the ink again with the tip of the  קולמוס  to let down excess ink from the  קולמוס .

The best kind of  קלף  for writing with  דיו לנצח  is dense, with no hair, and not porous. Avoid using low-quality porous spongy soft  קלף  which soaks the ink and causes spreading. The best way to test the quality of the 
קלף  is with test-water that contains 90% water and 10% alcohol. (For example: 1 part of vodka with 40% alcohol and 3 parts water, or 1 part of 90% isopropyl alcohol and 8 parts water.) Drip a drop of test water on the edge of the קלף . If the drop soaks in, in less then one minute, it is bad-quality קלף . If the drop stays on the קלף as a bead for three minutes or more, it is good quality קלף .

In the evening, or a few hours before use, turn the bottle or the ink-well upside down and shake well. A new bottle needs to be shaken longer for the first time. Wait a few hours for the foam to settle down.

For writing on  גויל  use only גויל without  קטירה. The קטירה  prevents the ink from adhering to the גויל .

דיו לנצח  can be diluted only with clean water, preferably distilled water. Do not add a  “מדלל”  or any other material to the ink. Be extra careful to keep the ink away from liquid Greek ink and from vinegar or any other acid. Do not leave the bottle open all night to make the ink thicker. Refill the  קסת  in the evening at the end of the writing day. Do not leave the  קסת  half empty overnight.

On a dry day, raise the humidity in the room to 60% . If the ink dries on the  קולמוס, it can be easily wiped off with alcohol (preferably 90%). All alcohol types are good. Wipe the  קולמוס  with alcohol, especially the slit, every 20-30 minutes, to prevent drying.  דיו לנצח  is water resistant - it does not wash off in water when dry.

To make corrections, wait for the ink to dry. Then, scrape it lightly with a sharp knife. It is easy to scrape off, and leaves a clean  קלף . The use of  דיו לנצח  saves a lot of time which is otherwise wasted on corrections.

Before folding  פרשיות של ראש  wait at least 24 hours, for more complete drying of the ink. After making a small correction on Tfillin or Mezuzah (which never includes a large area of ink) you can wait at least one hour for regular drying, then use a warm hair drier for a few minutes to speed up the drying. NEVER use a hair dryer on wet ink.The ink dries in stages. Complete drying of the ink takes about 3 weeks.

There is a special formula (#114) of  דיו לנצח  for use in a Rapidograph pen. To prevent drying of the ink when the pen is not in use, add a few drops of water to the pen cover before closing it, and keep the pen vertically with the writing tip down. To clean a clogged pen, soak all parts in alcohol overnight. Do not let דיו לנצח  come in contact with alcohol. It can damage the ink.

A Note About Sharp Writing

The  שלחן ערוך  and  קסת הסופר  say that  סת"ם  writing should be a little thick, avoiding sharp thin lines, to protect the ink from falling off too soon. Some  סופרים  write with sharp thin lines, contrary to what the  שלחן ערוך  and  קסת הסופר  say. Sharp writing looks nice when new and brings glory to the  סופר. However,  אור זרוע  says that a  סופר  should strive to minimize his own glory and maximize the glory of  שמים  by writing a little thick.

Most buyers don't know that the writing should be a little thick, without sharp thin lines. They want their  סת"ם  to remain kosher for as long as possible. Therefore, sharp writing may have in it an element of misleading the buyer.

With the Greek ink, thin lines remain on top of the upper fibers of the  קלף  and do not bind well to them. That's why they can sometimes fall off.  דיו לנצח  on the other hand, wraps the upper fibers and adheres well to them. The superb adhesion of  דיו לנצח  to the  קלף  helps the writing to be a little thick, as required.

To Order Dio Lanetzach Contact


טל. ארה"ב    Tel. USA     +1-570-906-8486


Limited warranty: If the ink is defective, the bottle will be replaced - no charge.
Statements herein may never be interpreted as a warranty on סת"ם. We have no control over the parchments or over what is done with the ink and how it is used after it is sold.

Each of the expressions in the following list, when used in relation to leather, parchment, ink, and paint products, is a trademark owned by Zvi Shkedi and his sons.

לנצחTM, דיו לנצחTM, סת"ם לנצחTM, מזוזה לנצחTM, תורה לנצחTM, מגילה לנצחTM, תפילין לנצחTM
קלף לנצחTM, כשר לנצחTM, כשרים לנצחTM, שחור לנצחTM
Kosher-ForeverTM, LanetzachTM, Dio-LanetzachTM

Copyright 2009 Zvi Shkedi. All Rights Reserved.
כל הזכויות שמורות
Statements herein may never be interpreted as a warranty
Patents pending