Sand in the bucket?

[wineview]

I purchased a bucket of Chancellor from the Finger Lakes Region. Racked it out of the bucket into secondary and there seems to be something like sand clinging to the sides. Very gritty. It also produced patterns on the bucket walls in a similar way that frost does on a window pane. Any thoughts? Is it indeed sand?

Thanks

 

[cmason1957]

It is probably tartartes that have dropped out of solution. Particularly if it was kept at a colder temp.

 

[wineview]

It is probably tartartes that have dropped out of solution. Particularly if it was kept at a colder temp.

The must was fermenting between 72-75*.