What is going on inside my Fuji Apples

I am new at selling apples. We have a 30 year old 100 tree orchard made up mostly of Fuji Apples. We have mostly used the fruit ourselves. We are at 2100’ elevation in Grass Valley. This year all the trees produced more than we could possibly use.
We picked a beautiful crop of old fashion green Fuji Apples. Brix is 18, super sweet. We harvested this weekend and I have about 300 pounds of perfect looking apples set aside for sale.
Yesterday we juiced the culls yesterday and almost all the apples had this weird greenish marks in the flesh as we cut them opened. I have no idea what this is or even how to google it. I tried to post pictures, but apparently can not yet.
Also, most of the apples have a black soot around the stem. Do I need to wash apples before I sell them. We just sell locally , not to stores.
Thanks for your help, Janet

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I believe it is watercore. Fuji is susceptible to it. I personally do not mind watercore apples. In some cultures like Japan, watercore apples appears to be a desirable trait.

https://www.canr.msu.edu/uploads/files/Watercore_in_apples.pdf.

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Thank you, I knew there had to be a name for it. Great article. Thanks for sharing.

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Great information and link.

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I’ve never seen water core that looks like that, it tends to be fairly translucent and not colored and I’ve never seen it in a narrow ring. I’m not saying it isn’t water core, only that my east coast water core looks entirely different. I see a great deal of it with several varieties, including Fuji. I first saw it decades ago on Tomkins King- it helped me ID the variety because it is famous for it.