Pure gold coating
A pure gold coating least likely to oxidize, highlights the pure favors and aroma of the coffee beans.

Gold (Au) is the least likely to oxidize among all metals.
Mesh dimension is even and not easy to be deformed because the material is metal, and no chemical change occurs as a result. Therefore, it is little affected to the taste and flavors of coffee.
Furthermore, we believe that a little amount of gold ions are making a positive influence on the taste of coffee.

Ionization tendency

The chart below shows that gold (Au) is the least likely to oxidize among all metals.
Furthermore, we believe that a little amount of gold ions are making a positive influence on the taste of coffee.

Mesh structure
Vertical-shape mesh enables it to extract oil and this shape is suitable for “High temperature-Short extraction”

While the mesh is big enough to be able to see with the naked eye, it has the advantage of extracting coffee flavor oil directly into the cup. Since hot water flows freely, it allows fast extraction which brings out fruity and clean characteristics of specialty coffee.

1.Vertical-shape mesh

Vertical-shape mesh allows hot water to flow smoothly and this shape is suitable for “High temperature-Short extraction” which brings the best flavor and characteristic out of the coffee. Therefore this brewing method is perfect for enjoying fruitiness and clean mouth feel that specialty coffee has to offer.

Filter with round mesh
Ground coffee can easily get clogged up in round mesh, slowing down the water flow.

Cores Gold Filter with
vertical mesh
Vertical-shape mesh allows hot water to flow smoothly without clogging up.

2.How mesh is made

The etching process is used for making the mesh. This allows hot water to flow freely for fast extraction.

The mesh is designed to encourage smooth flow of hot water.

Environmentally friendly
Environmentally friendly because paper filters and drippers are not required

Since Gold Filter can be used simply by setting to a holder, there is no consumption of a paper filter. It is economical because it does not generate garbage and is environmentally friendly. It is just washed with water after use, so the handling is also easy.

The difference in the annual cost between Gold Filter and a paper filter

When drinking a cup of 200ml coffee extracted with the metal filter daily for 365 days, the overall cost is up to 31,025 yen less than using paper filters.
(*Our research)

KINDS OF
THE HAND DRIP
Types of hand brewing methods

The same coffee can taste differently depending on brewing methods. There are various types of hand brewing methods, so you can change brewing methods and coffees depending on your tastes or feelings.

GOLD FILTER

  • Recommended grind size: Medium – Coarse
  • Extracts adequate amount of coffee oil
  • Brings out the full characteristic of coffee
  • Easy to brew with less mess
These gold plated mesh filters last for years, saving money on continued purchasing of paper filters, and it is easy to clean. Gold is highly resistant to chemical reactions, therefore the gold filter prevents coffee from becoming oxidized and brings the best flavor out.
Although coffee grounds will not be completely filtered out, (unlike paper filtered coffee) this filter is capable of extracting the coffee oil, which is the essence of coffee flavor, directly into the cup.
Since this filter brings out the full characteristic of coffee, it is best suited for brewing light to medium dark specialty coffee, with grind size between medium and medium coarse.
Extraction time will be short due to the free flow of hot water. This is suitable for bringing out clean and fruity flavors that specialty coffee offers.

PAPER FILTER

  • Recommended grind size: Fine – Coarse
  • Bright and clean mouth feel
  • Relatively affordable
  • Easy to maintain
Brewing coffee with the paper filter is easy therefore quite popular in Japan.
Since coffee grounds are not going through the filter, this brewing method makes coffee clean and smooth in the cup. On the other hand, coffee oil, which is an important source of coffee flavor, is blocked by the filter and doesn’t come out.
A dripper could be conical or flat-bottomed depending on the manufacturer. The lengths and positioning of ribs, as well as the number of holes can also vary.
These differences will alter the flavor profile of the extracted coffee. For example, long ribs will encourage faster extraction since there is less time for hot water to contact with coffee, it makes a clean and light-bodied cup. On the other hand, shorter ribs will slow the extraction therefore, ground coffee will contact with hot water longer, to make coffee richer and full-bodied.

NYLON FILTER

  • Recommended grind size: Medium – Medium coarse
  • Extracts adequate amount of coffee oil
  • Easy to brew with less mess
  • Costs less than metal filters
Comparing to paper filters, nylon filters are more economic as they are washable and reusable.
Mesh is generally bigger than paper filters and there is a variety of mesh sizes available. While paper filters absorb coffee oil, which is an important source of coffee flavor, nylon filters allow coffee oil to be extracted into the cup, just like gold filters.
However, an uneven pattern of mesh makes flavor inconsistent and the smell of nylon could sometimes be carried into the cup as well.

FLANNEL FILTER

  • Recommended grind size: Medium – Coarse
  • Round and thick mouth feel
  • Highlights sweetness and takes off some sharpness
  • Enables to give variety to tastes by brewing techniques
This brewing method is said to extract round body and full aroma out of a coffee.
Unlike paper and metal filters, the cloth expands when hot water is poured over it. This will help extract various flavors of coffee with round and full-bodied characteristics.
However, you need to have the special skill of slowly pouring hot water, drip by drip, in order to brew properly. In addition, the cloth filter is required to be washed each time, making this brewing method unpopular for domestic use.

FRENCH PRESS

  • Recommended grind size: Medium – Coarse
  • Abundant oil extracted for rich aroma and mouth feel.
  • Easy to use and consistent flavor
  • Looks good as an object on the table
Ground coffee is soaked in hot water before the metal filter is plunged down and coffee is poured through.
Mesh is usually made from metal or nylon which enables coffee oil to be extracted into the cup. Since coffee is infused in hot water for 3-4 minutes, every component including the ones with unpleasant characteristics will be extracted. Although this could be both advantageous and disadvantageous, this brewing method is suitable for high quality specialty coffee.

AERO PRESS

  • Recommended grind size: Medium
  • Suitable for brewing small amounts of coffee quickly
  • No coffee grounds, clean taste
Aeropress uses air pressure, which is applied manually, to extract coffee. Although there are aftermarket metal filters available, it usually makes use of paper filters therefore, coffee oil is not extracted. It makes cleaner coffee than French Press because it extracts all components of the coffee with the exception of coffee oil.
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