Does a Toothpick Match a Distribution Needle for Coffee Extraction?

A toothpick can stand in for a distribution needle in espresso preparation, but only partly. In three comparative extractions using the Warm Sun blend during Guangzhou's humid returning-south season, a needle distributor produced the most even coffee extraction, a toothpick helped under some conditions, and no stirring was clearly the weakest.

The needle breaks up static clumps that cause channeling in the puck, a practice traced to John Weiss in 2005. When the shots were served as iced Americanos for a blind test, tasters could not easily tell the difference, so whether americanos bitter or not depended less on the tool and more on the coffee and ratio.

In espresso preparation, a distribution needle is often used to break up clumps and stabilize extraction. But if you don't have a professional tool, can a toothpick serve as a temporary substitute? Taking advantage of the humid weather during Guangzhou's "returning south" season, Front Street Coffee used the Warm Sun blend to conduct three comparative extractions, observing the espresso performance with no needle distributor, with a distribution needle, and after stirring with a toothpick, and further made iced Americanos for a blind test. The results showed that the distribution needle does make extraction more even, and the toothpick also has some effect under certain conditions, but when paired with water or milk, the difference is not easily noticeable. This article will present the complete experimental process and conclusions, and explain the origin of the distribution needle and the correct approach to using it.

Front Street previously mentioned the distribution needle in an article introducing the tools needed for espresso, noting that it can help make extraction more stable. However, a friend asked whether a toothpick could replace the distribution needle, and reported back to Front Street that the effect was actually quite good.

It just so happened that Front Street had accumulated some toothpicks included with takeout orders, so we decided to personally compare the difference between toothpicks and professional distribution needles, and see whether toothpicks are really as useful as that friend said.

The role of the distribution needle

First, let's talk about why a distribution needle is needed. During operation, the grinder generates static electricity due to friction, which causes fine coffee grounds to attract each other and form clumps. These clumps can easily cause channeling in the puck during extraction, leading to uneven espresso extraction.

The distribution needle uses fine needles or similar tools to break up these clumps and readjust the density distribution of the coffee grounds, making them more uniform and thereby stabilizing extraction. This distribution method was invented by John Weiss in 2005. At the time, he was using a home grinder that produced severe clumping, and to solve the trouble caused by static electricity, he tried using fine needles to break up the clumps. Later, the practice of using a distribution needle or needle distributor to assist with distribution was named WDT (Weiss Distribution Technique, abbreviated as WDT).

Coincidentally, Guangzhou, where Front Street is located, became very humid these past two days due to warming temperatures, and the ground coffee happened to have some clumps. Taking this opportunity, Front Street extracted three espressos separately to observe the effects of not using a needle distributor, using a distribution needle, and using a toothpick on espresso extraction. (This experiment used the Warm Sun blend, with extraction parameters of 19.8g dose, 26s extraction, and 38g coffee liquid.)

The espresso stream without the needle distributor showed slight left-right swaying, and two instances of spraying caused by channeling occurred; in the extraction using the distribution needle, the coffee liquid appeared at the bottom of the basket almost simultaneously, and the stream remained stably centered without channeling; in the group using the toothpick, the latter part of the extraction showed slight swaying of the stream.

(From left to right: no needle distributor; using a distribution needle; using a toothpick)

Tasting the three espressos separately, all showed rich sherry aroma and caramel sweetness. The coffee without the needle distributor had a bitter finish compared with the other two cups; the cup using the distribution needle was overall balanced in acidity and bitterness, with no negative flavors; and the cup using the toothpick also had some slight bitterness, but not as obvious as the first cup.

Following the above steps, three more espressos were extracted again, and after adding 250ml of ice water to each to make iced Americanos, it was not easy under blind testing to distinguish which cup had been extracted with the aid of a distribution needle or a toothpick.

Through experimentation, it was found that the distribution needle can indeed make coffee extraction more stable, and a toothpick can also serve as a substitute to a certain extent.

However, if you are not tasting the espresso on its own, but pairing it with a certain proportion of milk or water to make other espresso drinks for daily drinking needs, the difference between using and not using a distribution needle seems not as great as imagined. Of course, if you find that the ground coffee has very obvious clumps and you don't have a distribution needle on hand, then temporarily using a toothpick as a substitute is also a good choice.

In the daily bar output of a coffee shop, speed and consistency are especially important. Using an extra distribution needle will lengthen the preparation time for each espresso extraction, which goes against the high efficiency that espresso coffee possesses.

- END - Front Street Coffee

No. 10, Bao'an Qian Street, Yandun Road, Dongshankou, Yuexiu District, Guangzhou, Guangdong Province

The above content is compiled by CoffeeHunters, a coffee news website.