Sɛ yɛbɛka no ɔkwan biara so a, ɛsɛ sɛ wɔde nneɛma a wɔde rɔba ayɛ no nwene denam nkuku a ɛne no hyia no so ma ɛyɛ nsusuwso, rɔba ade a ɛyɛ hyew kɛse, vulcanization a ɛyɛ nhyɛso kɛse, a efi nkuku no mu anaasɛ nsunsu mu no taa frɛ no nsunsu a wɔde gyae. Nneɛma a ɛho hia a ɛma rɔba nneɛma a ɛyɛ papa ne nkɛntɛnso a enya wɔ nneɛma a wɔyɛ no yiye so no mu biako a wontumi mmubu no yiye no mu biako. Ebetumi ama sintɔ ahorow te sɛ afã horow a wɔakyinkyim no ne nea wɔtetew mu aba, na ebinom mpo asɛe nsusuwso no, na ɛde ɔhaw aba sɛnea wɔyɛ no sɛnea ɛte daa no mu. Nneɛma a enye a ɛka rɔba nneɛma a wobubu no ho adesua no ho hia kɛse na ama wɔahwɛ ahu sɛ nneɛma a wɔyɛ no yɛ papa, wosiw sintɔ ahorow ano, wosiw nneɛma a wɔsɛe no ano, na ɛma nneɛma a wɔyɛ no tu mpɔn.