The original product is a home-made mix of water added to hydrated lime. Have a look in good DIY centres, large garden centres or agri stores. Or knit a large white sock.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
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I have a very dark area with a tree thst needs lightening up. This will be just the job
It also used to be used to paint the walls of the dairy on the farm where I was born.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.