Portierra deer leather

It is said that in Japan, about 600,000 head of wild deer have been culled a year as pests.

We are working to utilize the culled deer skin with our original tanning technique ‘Portierra’ which is an environmentally friendly process.


Availability of Portierra deer leather

Portierra deer leather is produced by an extremely safe process, it can be used free from anxiety. Portierra pure white leather is available even in one sheet.
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Processing of brought-in materials

Privately acquired raw deer hide is available for processing into Portierra deer leather.
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Portierra leather is certified by the international “Oeco-Tex Standard 100” which is one of the most famous and strict standards for textile goods.
In order to pass the standard, samples have to be tested and verified to not contain a bit of 350 toxic chemicals.

“ Leather ”

What is tanning ? 

Tanning is the process of treating skins and hides of animals to produce leather using tanning agent, in order to preserve raw hides from decomposition and prevent skins from hardening.

↓Portierra 「Tanning process」

Raw deer hides are pickled with salt. The skins are dehaired, degreased, desalted, and soaked in water.

We tan deer skins with our uniquely developed tanning agents

which are environmentally friendly.

Our tanning agents contain no toxic chemicals and heavy metals,
so even leather shavings that came out during the tanning process are safe and recyclable.

More than 90 percent of the leather in circulation in the world has been tanned with Chromium.

However, the leather which is tanned with our tanning agents is far safer than the leather which is tanned with Chromium and much softer than the leather which is tanned with tannin.

You are able to dye the leather at any color including a pale color, because the color of tanned leather with our tanning agents is pure white.

The modern trend words, such as eco-friendly,
ethical and sustainable have been used and people are already used to hearing them.
We are producing environmentally-friendly leather for a long time.

We have been using all parts of deer skin exhaustively without removing any portions that could be considered inferior. We are able to cover up inferior spots with a coating, but prefer to provide uncoated deer leather. You can then enjoy a more natural, smooth texture and a natural transition as the leather ages.

To maintain this high level of quality, some deer leather may have scrapes or abrasions on the surface, which lend individual character to each product.

Deer Leather

We are using wild deer skins for Portierra deer leather. As mentioned above, wild deer skin occasionally has minor damage such as scars and openings from wound. However, the softness of deer leather itself is unlike cow leather or pig skin, and long-lasting, so that we have been using deer leather as high-ranking leather for many years.

Portierra White (undyed) tenderized finish

Portierra Natural (botanical tannin) tenderized finish

Portierra Natural (botanical tannin) stiffened finish

Portierra Yellow (synthetic dye) tenderized finish

Portierra Purple (synthetic dye) tenderized finish

Portierra Black (synthetic dye) tenderized finish

Countrywide problems caused by wild deer

The major damage caused by wild deer has become an issue of public concern.

It is said that in Japan, damage to agricultural products caused by wild deer costs between six and ten billion JP Yen a year.

From 1990 to 2015, the deer population has soared from 400,000 to 4,000,000.
The Japanese government has decided to reduce the number of wild deer by 50 percent in the next 10 years in order to decrease crop damage by wild deer.

Most of the culled wild deer is burned or left to rot. Less than 10 percent is used for meat, and less than 1 percent is utilized for leather.
Our company’s ethical standard is based on the belief that we should thank nature for blessing us with deer by making good use of their meat and leather.
We would like to assist in solving this environmental problem through our work with leather.

↓This is a video which gives vivid description of a dissection of a wild deer. Please be advised that some scenes may be odd. 

Portierra White

A basic color of Portierra leather which is solid natural white.
You are able to dye Portierra white leather any colors including pale colors, because the base color is pure white.

Botanical dye

A dye which is compounded with a dye extracted from plants and a synthetic dye.
You can enjoy a natural, gentle and tender color dyed on the Portierra white.


Natural indigo

A dye which is compounded with Portierra white and a natural indigo provided by Kosoen Co., Ltd. (https://www.kosoen-tennenai.com)

A compounded indigo

The parts of occasional minor damage such as scars on deer leather don’t take compounded indigo dye very well. As a result, beautiful unexpected patterns come out.



"Eco-tone" is a dyeing technique: a reaction with iron and polyphenol that is contained in barks.
High degree of specialization is required for the dyeing process. However, we are able to achieve a drastic reduction of contamination by dyestuff using Eco-tone tech, so the Portierra leather dyed with Eco-tone is really environmentally friendly natural leather. This technology deserves a greater attention in the leather industry.  

For keeping a healthy environment internationally

We are conducting activities aimed at improving a working environment, not only in Japan but also in overseas countries. 
There is an area in mid Bangladesh that is famous for the leather industry.
This region is packed with a large number of leather-related factories. Almost all of them are using toxic chemicals, such as Chromium or heavy metals. A huge quantity of untreated industrial waste water, reportedly up to 22,000 cubic meters per day, has been dumped into rivers and oceans.
As a result, the water contamination has been causing many kinds of health issues.
In order to solve this controversial problem, the Bangladeshi government has designed a new project plan. They have developed a new industrial area in northern Dhaka and set up a sewage treatment plant in order to facilitate relocation of all factories in mid Bangladesh to that area. However, they say, it will take a long time to realize the plan due to an indemnification and too many responsibilities for relocation expenses. 
So, we are in cooperation with some tanneries in Bangladesh in order to produce environmentally friendly Portierra leather there.  Preventing soil, water resources and the Bay of Bengal from contamination is a part of our environmental goal. It also coincides with the policy of the Bangladeshi government, as well as the leather industry as a whole.

“ About Us ”


tierra = the globe, the earth

por tierra = for the earth

 The number of Japanese wild shika deer has been multiplied in these past few years,
so a large quantity of deer has been culled and thrown away. 
We are trying to use those wild deer leather as a useful material nurtured by nature,
using our unique tanning technology which is environmentally-friendly.
Portierra is a brand name of the global environment first.



We are carrying out R&D for new techniques for tanning wild animal leather. 
Combining traditional and modernity,
our laboratory is located in a renovated traditional Japanese house in Hyogo prefecture.

Corporate information

Corporate name: A.I.C. Corporation

Main Business: Environmentally-friendly leather products

Address: 249, Nakamura, Tstuno-cho, Tatsuno-City, Hyogo 679-4126, Japan

Tel: +81-791-60-3685


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