After putting quartered walnuts in alcohol, the concoction got totaly
black after 24 hours. Is it normal ?

Does it have to stay on sun all day, from dawn to dusk ? I have
enough sun on my windowsill up to midday.

I know traditionally green walnuts are picked up on June 24, but I
couldn't get them ad that date, I picked them up on July 18th, but
the June was rainy and without much sun. Will it affect the taste,
will the Nocino be too bitter ?

Thank you.