Netizens are impressed with how manufacturer admits fault and tackles the problem scientifically.
Japanese rice crackers, or senbei, are delicious when eaten plain or wrapped with a bit of seaweed. The crunchy snacks are so versatile that people even think it’s a good idea to stuff them full of edible wasps.
They usually come in large packets, but when Japanese Twitter user @moyu1001 opened hers, she discovered large black spots on one of the senbei. Unsure if they were burnt spots or patches of mold, she sent the package back to the manufacturer, Kameda Seika.
▼ The company promptly replied @moyu1001 with a lengthy
explanation of their manufacturing process (translation below):
亀田製菓のまがりせんべいを買ったら、大きめの黒いカビなのかコゲなのかわからない部分を見つけて、初めて見たレベルの大きさだったから、一応連絡して現品を送りました。
— こうやもゆ(もゆ山) (@moyu1001) February 13, 2018
こんなに…こんなに丁寧に対応してくれたよ…。そしておせんべいも送られてきました。一生推すね…。 pic.twitter.com/gWndBxwVAo
“Dear Madam,
We wish to express our gratitude for your continued success in the future and we greatly appreciate your continued patronage of our products.
We sincerely regret that you’ve experienced such unpleasantness caused by our ‘18-piece magari senbei’. We deeply apologize and truly thank you for letting us know about it.
We’ve graciously received the product from you on 5 February.”
(continued below)
▼ There’s so much politeness oozing from the letter that any customer,
angry or not, would have forgiven them on the spot.
“1. Product confirmation
Upon inspecting the sample that you’ve generously provided using our company’s microscope, we’ve confirmed that there were no traces of mold spores or fungal characteristics. In order to further identify the cause of the black spots, we sent the product to our in-house quality assurance department to undergo Fourier Transform Infrared (FTIR) analysis. This process involves the discharging of infrared rays towards the target, allowing us to determine its characteristics based on infrared absorption or emission rates.
The analysis conclusively revealed that the spots’ constituents matched starch and protein profiles of ‘magari senbei’, and that they are essentially the result of charring.”
(still continued below)
▼ So it’s not mold, but burnt stuff?
“2. Causative factors
During the roasting process, the batter travels on a wire mesh conveyor belt and gets heated by 20-meter long infrared burners situated below and above the belt.
Vibration from equipment operating continuously at high temperatures might have resulted in charred product fragments dropping onto the surface of the senbei.
Our company conducts daily health and safety checks, performing tests before and cleaning procedures after operation. Even during manufacturing, we strictly adhere to quality standards and conduct regular checks. Products unable to meet specifications are swiftly removed, but as your product has shown, it proved to be inadequate. We apologize for the inconvenience caused.”
(yes… still continued below)
▼ You can almost feel the writer of the letter kneeling apologetically.
“3. Preventative measures
The wire mesh conveyor belt is wiped once daily before operation commencement, but we’ve decided to thoroughly clean it again after lunch break. Depending on the belt’s condition, we’ll perform additional cleaning procedures to ensure such events do not occur again.
To provide ease of mind to our valued customers when consuming our products, we will endeavor to prevent such accidents from happening again. We greatly appreciate your continued patronage.
We’ve provided a fresh packet of senbei for you to enjoy.
In closing, we hope for your health and good fortune.”
@moyu1001 was glad the black spots didn’t turn out to be fungi, but more than that, she was rather impressed with the exhaustively detailed letter from the manufacturer. Japanese companies treat complaints very seriously, which is why some even go as far as apologizing for minor 20-second-early train departures.
Source: Twitter/@moyu1001 via Hachima Kikou
Featured image: Twitter/@moyu1001
Insert images: Pakutaso (1, 2, 3)




Preserve a piece of Japanese culture during Corona with your own mini shrine hand-washing ladle
12-year-old British girl who went missing in Tokyo found safe after visiting anime sites around Yokohama
Japan’s Rabbit Island in danger of becoming Boar Island, tourists asked to follow feeding rules
Japanese workers reveal their top five mysterious rules they wish would disappear【Survey】
Stay at a hotel with a bed for your plushie in Japan
Japanese convenience store sunglasses just became our newest Convenience Wear obsession
Tokyo giving out free furoshiki from Pikachu’s designer to help tourists carry their garbage home
A practical guide to freezing your boss’ hat in a block of ice [Photos]
Kyoto shop turns traditional Japanese kimono into teddy bears, with special meaning hidden in their patterns
Starbucks Japan releases two new seasonal drinks that blur the line between summer and autumn
Totoro shaved ice wows Studio Ghibli fans in Tokyo for a very limited time
Study finds hundreds of people in Indonesia legally named after Naruto, Inuyasha, other anime stars
12-year-old foreign tourist missing in Japan, police asking for help finding her [Video]
Studio Ghibli adds new Jiji’s baby plush toy to its anime merchandise range in Japan
Japanese gacha machine in Shibuya now sells tiny capsule terrariums
The Japanese city where ordering grilled chicken doesn’t guarantee you’ll actually get chicken
Japanese airlines set to cut fuel surcharges for international flights in September and October
Beautiful off-the-beaten-path spot near samurai castle in rural Japan looks like a Monet painting
Tokyo subway installing new ticket gates that don’t accept payment through Suica or other IC cards
New Shinkansen luggage drop-off system begins in Japan, making train travel even easier
Air-conditioned dress shirts arrive in Japan to save working professionals from sweltering heat
Japanese Shinkansen becomes an overnight hotel for three nights this summer
Pokémon Center Online designates first Pokémon items that will require Japanese ID card to buy
Japanese toilet aims to attract foreign tourists but not everybody is happy about it
99-year-old woman rescued while attempting to climb Mt. Fuji
Tokyo’s newest viral dessert is like a Japanese parfait inside a bread bun [Taste test]
New Japanese vending machine at Shinkansen station sells cups of ice on platform
Japan announces sudden 400-percent increase in visa fees for foreigners entering the country
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Studio Ghibli has a new anime out, and there’s only one place in the world where you can see it
Starbucks Japan releases new drinkware and goods for Valentine’s Day
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Japanese ninja certification exam attracts 131 candidates from Japan and abroad
Salomon releases Japan-exclusive Mt. Fuji hiking gear that doubles as an amazing souvenir
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】