How long will this keep? Will freezing it help it longer?

I wouldn't freeze it because I wouldn't have it around that long.

After opening the package, can we keep it in the room temperature?

Mine has been open but I put it into a large Ziploc. It's fine at room temp as long as it's dry and not exposed to moisture.

Would this be considered white or yellow koiji?

Miyako Kouji is produced using both white and yellow kouji.

How do I make more koji using this?

Koji original form is rice (shown in the bag) if you want to make more then grind into powder to achieve the flour base if your wanting to use it for drenching foods before cooking or to age your beef over a day or two. I don’t know if this answers your question

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IseSo Miyako Koji 1kg

Product ID: 24065522

Details

Brand
Isesou
Item Package Quantity
1
Item Weight
1.02 kg
Number of Items
1
Unit Count
35.27 Ounce

🌿Vegan & All-Natural Powder

🍚100% Domestic Rice Base

📦1kg Bulk Bag for Long-Term Use

HK$490

Duties & taxes included

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Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🍶 Elevate your kitchen with authentic Japanese koji — the secret ingredient you didn’t know you needed!

GENEROUS 1 KG BULK PACK - Perfect for sustained culinary creativity and long-term storage.
HANDMADE ARTISAN QUALITY - Traditional dry-work method ensures rich, consistent fermentation.
VEGAN FRIENDLY NATURAL - 100% plant-based, no additives—ideal for conscious foodies.
PURELY DOMESTIC RICE POWER - Crafted from 100% Japanese rice for authentic flavor and quality.
TOP RANKED WINEMAKING INGREDIENT - Trusted by pros, ranked #15 in winemaking essentials.

IseSo Miyako Koji is a premium 1kg bag of handmade, vegan-friendly koji powder made from 100% domestic Japanese rice. Perfect for fermentation, pickling, and winemaking, it offers long shelf life through traditional dry processing. Highly rated and favored by culinary professionals, it’s a must-have for authentic Japanese seasoning and gourmet experimentation.

Specifications

ASIN	B004FHB5OO
ASIN	B004FHB5OO
Best Sellers Rank	#22,070 in Grocery & Gourmet Food ( See Top 100 in Grocery & Gourmet Food ) #15 in Winemaking Ingredients
Brand Name	Isesou
Coin Variety 1	Rice
Container Type	Bag
Cuisine	Japanese
Customer Reviews	4.7 4.7 out of 5 stars (2,637)
Item Form	Powder
Item Package Quantity	1
Item Package Weight	1.02 kg
Item Type Name	food
Item Weight	1.02 kg
Manufacturer	Iseso Co., Ltd.
Manufacturer	Iseso Co., Ltd.
Number of Items	1
Part Number	25080
Product Dimensions	1.73 x 11.22 x 8.27 inches; 2.25 pounds
Set Name	Rice
Size	2.2 Pound (Pack of 1)
Specialty	Vegan
Unit Count	35.27 Ounce
Units	35.27 Ounce

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HK$490

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The delivery time was excellent, and the packaging was secure.

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