Unless thoroughly diluted, bitumen never fully solidifies and will in time corrupt the other pigments with which it comes into contact.
ʌnlˈɛs θˈʌɹoʊli daɪlˈuːɾᵻd, bɪtˈuːmɛn nˈɛvɚ fˈʊli səlˈɪdᵻfˌaɪz ænd wɪl ɪn tˈaɪm kɚɹˈʌpt ðɪ ˈʌðɚ pˈɪɡmənts wɪð wˌɪtʃ ɪt kˈʌmz ˌɪntʊ kˈɑːntækt.