Does the V60 Metal Dripper Impart a Metal Taste?
A science-y approach
N=10 (small group of coffee lovers working in an office), one trial
- Pre-wet bleached filter with 100g of water (200°F) – this was to ensure no pulpy taste was present
- Disposed of pulpy water, then added 400g of water (200°F) – evenly distributed flow on inner wall of dripper
- 20 minute cooldown so that it's drinkable
- 2x Acme Taster Cups 110ml
- 2x Hario Conical Beaker 500ml
- 1x Hario V60-02 in Silver Metal
- 1x Hario V60-02 in Clear Plastic
- Hario 02 Paper Filters (Bleached)
- Fellow Stagg EKG Stagg Kettle
- Reverse osmosis filtered water
Ten subjects were asked to differentiate the flavour of water filtered through a metal and plastic V60 dripper. The objective was to see whether the dripper material imparted flavour to the brewing water. All of the participants were Eight Ounce employees or customers, with a moderate to advanced level of knowledge regarding coffee tasting and pour over methods.
Both pour overs were made in a similar fashion to that of making coffee, but having no coffee, and more focus towards evenly pouring the hot water on the inner sides of the material.
In front of the subjects were two preheated ceramic Acme Taster Cups, as well as two labelled placemats – “plastic” and “metal”. All taster cups were labelled on the bottom for the supervisor of the test to identify the dripper used.
The subjects were given three options. They were told that each cup could be filled with either a.) metal in one cup and plastic in the other, b.) plastic and plastic, or c.) metal and metal – no mix of the two liquids were included in the test. However, it was pre-planned that each of the subjects would be given metal in one cup and plastic in the other. Subjects were not aware of this, but were given the three scenarios to avoid any bias from preconceived differences in taste.
Since the placemats stayed in place on the table (metal being on the subjects right, plastic on the left), a reverse answer was calculated as wrong, i.e metal pour over water put on "plastic" placemat, vice versa.
Alright, onto my sort-of scientific results 👩🏻🔬
- Both cups tasting like metal = 2 people (20%)
- Both cups tasting like plastic = 3 people (30%)
- Plastic and metal put on the opposite placemat = 2 people (20%), one being a customer
- Plastic and metal put on the correct placemat = 3 people, (30%), including one participant with a cupping spoon
The results show a total of 7 subjects (70%) answering incorrectly by not placing the two cups on the appropriate placemat. A total of 3 subjects (30%) answered correctly by placing the two cups on the appropriate mat. It should also be mentioned that all participants had trouble distinguishing the flavours – even with a cupping spoon.
This was just a simple experiment showing no noticeable difference in the flavour of water made from a metal and plastic V60 dripper. However, this is by no means a perfect study. There are so many factors that could be included, such as increasing the number of trials and participants, or using scientific tools for a more detailed measure. My hope for this study is to raise some awareness about the difference in materials, as well as push someone to take this experiment further.
So, do I think this dripper is a good choice? Absolutely!
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