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)




Japanese company creates scratch and sniff cards that smell like the bellies of cats and dogs
Pokémon Card Stores requiring facial recognition scans for entry in Japan in latest anti-scalper move
A roadside hair salon stall in China made us Norway’s Haaland for US$1, and warmed out hearts too
Starbucks Japan brings back the Caramel Waffle, but is it as good as it used to be?
Japanese government okays plan to create a backup capital city
Japanese Shinkansen welcomes overnight guests for one night during summer festival
Japanese Coo-Che becomes a viral sensation, and everyone wants a taste
Studio Ghibli Laputa figure looks like it’s really flying thanks to cool visual trick
How are you supposed to wash a Japanese futon duvet at the laundromat?
Family Mart’s new Famima flagship in Tokyo has a hidden gem that most visitors miss
Why is Taco Bell failing in Japan, even as the country falls in love with tacos?
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
Japanese Shinkansen becomes an overnight hotel for three nights this summer
99-year-old woman rescued while attempting to climb Mt. Fuji
Which country’s foreign tourists spend the most money per-person in Japan? Hint: Not the U..S. or China
Giant Evangelion Spear of Longinus to be installed at Japanese train station with Eva art trains
Starbucks Japan releases a miniature display rack so you can create your very own store at home
Face lettuce appears in Japan, with the face of Death Note’s Light Yagami, but why?
Cup Noodle releases cold-water instant ramen in Japan, but can it really be made with just cold water?
Kodama Shinkansen trains on popular Japan route get a whole new look this winter
Studio Ghibli has a new anime out, and there’s only one place in the world where you can see it
Salomon releases Japan-exclusive Mt. Fuji hiking gear that doubles as an amazing souvenir
Japan now has human refrigerators inspired by Japanese vending machines
Hatsune Miku collaborates with Hokusai’s art in new Vocaloid ukiyo-e illustration series [Pics]
Japan triples departure tax, foreign tourists and locals now must pay more to leave country
Studio Ghibli releases anime T-shirts that pay homage to one of Hayao Miyazaki’s most personal films
Family Mart opens new “Famima” flagship store in Tokyo that’s like a tourist attraction
Sanrio Character Poll announces winners, Hello Kitty absent from top 10 in many countries
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
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
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】