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 Uji 2.2 lbs (1 kg)

Product ID: 729746062

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Details

Brand
伊勢惣
Package Information
Pack
Number of Items
1
Item Weight
1 Kilograms
Item Form
米

🧫Pure Koji bacteria culture

⚖️1 kg premium weight

🇯🇵Authentic Japanese origin

Description

🍚 Elevate your kitchen game with authentic Japanese Koji magic!

NATURAL SAFE - Contains natural Koji yarn fibers—no quality compromises
COMPACT CONVENIENT - 1 kg pack sized for easy storage and consistent use
LONG LASTING FRESHNESS - Dry form ensures extended shelf life without losing potency
AUTHENTIC JAPANESE QUALITY - Crafted from 100% Japanese rice with traditional Koji bacteria
VERSATILE CULINARY POWERHOUSE - Perfect for handmade miso, Amazake, and Kouji creations

Iseso Miyako Uji Rice Koji is a 1 kg pack of premium Japanese rice inoculated with traditional Koji bacteria. Ideal for crafting artisanal miso, Amazake, and other fermented delicacies, this dry Koji maintains its potency over time, offering both authenticity and convenience for culinary enthusiasts seeking to master Japanese fermentation.

Specifications

Size	1 kg (x 1)
Region of Origin	Japan
Unit Count	1000.0 Grams
Color	White
Manufacturer	伊勢惣
Product Dimensions	4.39 x 28.5 x 21.01 cm; 1 kg
Is Discontinued By Manufacturer	No
Storage Instructions	Store in a cool place away from direct sunlight
Country of Origin	Japan

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