Corroblock removes viruses and bacteria!

Naturally derived and safe! For coronavirus control ☆

Compared to alcohol-based sanitizers
Safe and secure! Strong sterilization!

Korobloc is plant-derived, so it is safe and secure! It is safe to use in homes and facilities with babies and the elderly.

The point is here! ◆ Point!
0 Alcohol free
0 100% natural material
0 Raw materials cultivated without pesticides
0 Made in Japan

Coloblock” is a naturally derived ingredient.
Fatty acid flavonoids extracted from grapefruit seeds are natural antimicrobial agents (GSE) and have antioxidant properties similar to catechins, which are considered nature’s antibiotics. It is mildly acidic, odorless, and non-irritant.
*Accepted as a food additive.

■ For inquiries and orders, please contact Polastan.
　　　TEL: 048-259-1350
Mail: info@plstn.co.jp

A natural sanitizing spray!About Colobrock

Organic farmers have found a natural, non-chemical sanitizing product.

☆ Efficacy of Grapefruit Seed Extract (GSE) in “Coloblock

How to use “Koroblock

Spray directly onto the target area at a distance of 10-20 cm and allow to dry.

Location & Effectiveness of “Koroblock

○ Indoors of nursing homes, hospitals, schools, restaurants, etc.
Rooms for people sensitive to pollen and other particulate matter
Sterilization and antibacterial of toys, pet toilets, walls, etc.
Sterilization of doorknobs, desks, kitchen area, equipment, etc.
○ Sterilization and antibacterial by spraying on masks, clothes, and bedding

Product Overview of “ColoBloc

Contains naturally derived ingredients and is mildly acidic for safe sterilization. Only two ingredients, grapefruit seed extract and water, are used.
Flavonoids, natural antibacterial agents extracted from grapefruit seeds, are also known as nature’s antibiotics.It also has antiviral and other benefits, inactivating a wide range of viral groups, including bacteria, foodborne pathogens, mold, and influenza. It also has antioxidant properties similar to those of catechins.

Because it is non-alcoholic, it does not volatilize quickly like alcohol sanitizers. It is also chlorine-free, so it does not have a pungent odor and can be used widely for sterilization in hospitals, schools, cooking facilities, and homes.

Coloblock adheres to the viral envelope and destroys the protein membrane that makes up the envelope by absorbing water through the difference in osmotic pressure, thus exerting its antiviral effect without being affected by the characteristics of the spike.
*For non-enveloped E. coli and other bacteria, the test results can be inactivated.

Comparison of “Koroblock” with other products

☆ Points of “Colobrock” ☆

Antimicrobials extracted from grapefruit are manufactured by other companies.The differences among the companies vary greatly in the parts of the grapefruit from which the grapefruit is extracted, the method of extraction, and the effects of the additives used.

Koroblock is a Japanese-made disinfectant/deodorant characterized by its unparalleled ultra-pure quality, which is achieved by extracting unsaturated fatty acids from the seeds only using a proprietary technology in a solvent, and then purifying it by removing the solvent and impurities.

Shut out viruses and bacteria with Colobloc!

No need to wipe off! Safe and secure, naturally derived! Disinfects well!

KoroBlock” is a disinfectant/deodorant spray with a new mechanism that destroys viruses and bacteria by sucking out the moisture within the virus. It is alcohol-free, plant-derived, and safe to use in homes and facilities with babies and the elderly.

■ For inquiries and orders, please contact Polastan.
　　　TEL: 048-259-1350
Mail: info@plstn.co.jp

Koroblock” Q&A: Questions about Koroblock

What does Colobloc work against?
Experimental results have shown that Coloblock has bactericidal and antibacterial effects against influenza A and other viruses, Salmonella, Staphylococcus aureus, Pseudomonas aeruginosa, enterohemorrhagic E. coli, O-157 and other bacteria, and black mold, blue mold, aureopacificidium and other molds.

Is it safe to put the Coloblock on my face and hands?
Don’t worry. The ingredients in Korobloc consist of water and grapefruit seed extract, so it is 100% natural. Please feel free to use it. It can be used on masks, around the kitchen, and in places where infants and toddlers come in contact with it. If you notice anything unusual, flush with water.

Should I wipe off the area where I applied the coloblock with a towel or something?
Do not wipe off and allow to dry as is. If you are concerned about deterioration, discoloration, color fading, or staining, please test the product in an inconspicuous area before use.

I hear that the solarene in grapefruit ingredients can cause spots when exposed to UV rays.
Please be assured that the grapefruit seed extract contained in the Coloblock component does not contain solarene.

How is it different from alcohol sterilization?
Alcohol is highly volatile and its antimicrobial effect does not last, while Koroblock does not volatilize quickly.It is also safe and secure because it is made of 100% natural materials that are gentle to the body.

Where should I keep them?
Store at 0°C to 40°C, avoiding high temperature, high humidity, and direct sunlight. Ingredients may deteriorate.

*Not all bacteria are eliminated or antimicrobial.
*Not all viruses are removed.
*Effectiveness was verified with one envelope type virus.

For inquiries and orders of the sterilization spray “Coloblock”, please contact
　Please contact Polastan.
　　　TEL: 048-259-1350
Mail: info@plstn.co.jp