zomwe zimatha kusintha masterbatch ndi ufa wamtundu kumitundu yosiyanasiyana molingana ndi zomwe kasitomala amafuna, kuti apange mitundu yosiyanasiyana ya ulusi wopaka utoto, komanso kuthamanga kwamtundu kumakhala pafupifupi giredi 4-4.5, yokhala ndi zilema zochepa.