Hi all!

Basically I know nothing of gardening, all I do know is that I freakin' love dekopons and I found a seed last week. So last week while eating a sumo orange at work I found this little beauty (a rare occurrence it seems). I left the seed at the office as I had a business trip I had to leave for and I came back today to find a fine layer or white mould on my precious seed! So far I have soaked the seed in warm water and cleaned it using hand sanitiser. I've dried it off and it has somewhat split open (see photo).

My question is the seed still usable?