Mutenka Sekken Honpo (Marubishi Soap)

"Cold-process production" without using fire. What is Mutenka Sekken Honpo (Marubishi Soap)?

The original brand "Mutenka Sekken Honpo" (Additive-Free Soap Honpo) is developed by "Marubishi Soap Co., Ltd.," which has its factory in Miki City, Hyogo Prefecture. Since its founding in 1955 (Showa 30), the company has been a specialist in handmade additive-free soap, consistently pursuing soap making that is gentle on both skin and the environment.

The greatest commitment is the adoption of the "cold-process production method," which uses no fire at all and slowly matures the soap for over a month (about 40 to 90 days) using only the natural heat of reaction — rather than mass-production-oriented machine kneading or the kettle-boiling method that applies heat. Although it is a method that takes considerable time and effort, it can lock high-quality heat-sensitive beauty components and natural moisturizing components (glycerin) entirely into the soap without destroying them.

Representative Brands & Series

Mutenka Sekken Honpo develops a diverse range of soaps that can be used with peace of mind by everyone from babies to people with sensitive skin — without using any preservatives, quality stabilizers, synthetic fragrances, or synthetic colorings.

"Wa no Mutenka Sekken (Rice Bran, Sake Lees, etc.)" delivering live ingredients

A signature series that maximizes the strength of the cold-process method. "Kobe Sake Soap" uses sake lees from local famous sake, and "Rice Bran Soap" uses high-quality rice bran rich in vitamins and minerals. Because the active ingredients such as amino acids and enzymes inherent in the materials are not destroyed by heat, the after-wash feel is "moist and supple" — as if you\'ve applied a beauty serum.
Other variations leveraging nature\'s bounty — such as "Goat Milk" and "Honey" — are also abundantly available.

"Premium Additive-Free Soap Gift Set" to give to someone special

The exquisite soap that craftsmen carefully cut and beautifully polish one by one by hand is also highly rated as a gift. Assortment sets where you can use four types of soap according to mood come in elegant cosmetic boxes — enjoying overwhelming popularity as a "thoughtful gift" that cares for the recipient\'s body, for occasions such as Mother\'s Day, year-end gifts, and celebratory gifts.

Looking for a special gift like Mutenka Sekken Honpo soap?

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Frequently Asked Questions about Mutenka Sekken Honpo

Q. How is cold-process soap different from ordinary soap?

A. Heat-sensitive beauty components remain as-is, providing overwhelming moisturizing power.
While ordinary soap is made by forcibly drying it over several hours to several days, the cold-process method matures it through natural drying for over a month. During this process, the natural moisturizing component glycerin is abundantly generated and remains — preventing tightness of the skin while removing dirt, achieving a gentle washing sensation like a beauty cream.

Q. Since preservatives are not added, is there an expiration date?

A. About 3 years if unopened, but we recommend using it as early as possible.
Since no chemicals such as preservatives or antioxidants are used at all, depending on the storage environment, natural oils may oxidize, and the color or fragrance may change. Avoiding direct sunlight, high temperatures, and humidity, storing in a cool place, and using it up as soon as possible after opening are tips for maintaining quality.

Q. The soap seems to melt easily?

A. It\'s proof that moisturizing components are abundantly included. Please use a well-draining soap dish.
Cold-process soap contains many moisturizing components such as glycerin, so it easily attracts moisture from the air. If left in the bathroom, it may melt into mush. After use, drain water well and store in a well-ventilated place, or we recommend using a magnetic soap holder that suspends the soap.