ðɛɹˌɑːɹ sˌʌm fˈɪlmz ɹᵻvˈɜːsəl fˈɪlm ðæt kæn ɡˌoʊ fɹʌm pˈɑːzᵻtˌɪv tə pˈɑːzᵻtˌɪv ɔːɹ nˈɛɡətˌɪv tə nˈɛɡətˌɪv bˌʌt ɑːɹ nˌɑːt jˈuːzd vˈɛɹi ˈɔfən.
There are some films (reversal film) that can go from positive to positive or negative to negative but are not used very often.