Ukuveliswa, i-fatory ihlawula ingqalelo ye-sepcial kwi-prodtaction yendalo kunye nokusetyenziswa kwamandla amatsha.Thatha "umhlaba oluhlaza" njengesikhokelo semveliso.
Iimveliso eziphambili ziyi-Lead Nitrate, i-Zinc Sulphate, i-Sodium Metabisulphite, kunye ne-Sodium Persulphate.
IOfisi yethu
