Jaques d'Alltrades wrote:

The message 1g49fl7.1v4xir1u4qrciN%00senetnospamtodayta@macun limited.net
from (Jim W) contains these words:

Gypsum (calcium sulphate, as opposed to 'lime' which is calcium
carbonate) is either sold as itself or by various 'brands' such as
claybreaker..

Slaked Lime = calcium hydroxide

Quicklime is calcium oxide.

Chalk is calcium carbonate.

--
Rusty Hinge

Ta muchly for that elucidation;-)

Jim