Ka taea te whakamahi i te gelatin mō ngā mahi whakaahua?

Ahau.Te Hiranga o te Hītori;

te tiakarete i huri i te whakaahua i te rautau 19, hei whakakapi i ngā tukanga pereti mākū uaua. Hei here i roto i ngā whakapūtanga halide hiriwa, i tohatoha ōrite i ngā tioata tairongo mārama ki runga i te kiriata, kia koi ake ai ngā whakaahua. Nā tōna kaha ki te pupuhi i roto i te wai i ngāwari ai te whakawhanake, kia taea ai e ngā kaitapere te uru atu ki te whakaahua.​

Tuarua.Ngā Painga Hangarau;

Ka whakahaere te tiakarete i te tipu o te tioata hiriwa halide, ka pā ki te tere me te rerekētanga o te kiriata. Ko ngā whakapūtanga angiangi mō ngā whakaahua he iti te kukū o te tiakarete, ko ngā kiriata tere-rahi ia me nui ake te tiakarete hei whakau i ngā tioata nunui. Ka tiaki hoki i ngā whakapūtanga mai i te kino miihini me te haumākū, ka roa ake te ora o te kiriata. Tae noa ki tēnei rā, kāore anō kia rite te hototahi o te tiakarete ki ngā matū e aro ana ki te mārama.

III.Te Hiranga o ēnei Rā;

Nā te whakaahua mamati i whakaiti te whakamahinga o te gelatin, engari kei te mau tonu i roto i ngā tono motuhake: ngā pepa tā toi-pai, e whakarei ake ana tōna kakano i te hohonutanga o te ahua; me ngā kiriata pūranga, e whai hua ana mō te pumau mo te wa roa. Kei te whakamahi tonu ngā ahumahi motuhake pēnei i te whakaahua hauora (X-ray) i ngā emulsions e hangai ana ki te gelatin mō tōna taumira teitei me te pono, e whakaatu ana i tōna uara hangarau pumau.