★ Emva umphezulu mqengqeleki mqengqeleki emva kokucima umngxunya wangaphakathi, ukuguba kunye nomgangatho wokulinganisa onamandla okroliweyo ngesitayile somngxuma, ukutyabeka ngokulinganayo, ukusetyenziswa kancinci kweplastiki.
Umphezulu womqengqeleki wogqirha ngokusila kunye ne-chromium plati enzima