The official language found in 3rd century CE documents in this region is Gandhari Prakrit written in Kharosthi script; their use in Loulan and elsewhere in the Tarim Basin was most likely due to the cultural legacy of the Kushan Empire, and introduced by Gandharan migrants from the Kushan Empire. These Gandharan migrants are also believed to have introduced Buddhism to Loulan. Although Gandhari was used as the administrative language, some words generally thought to be of Tocharian origin are found in the documents, suggesting that the locals spoke a language that belongs to the Tocharian group of languages. This original language of Loulan is referred to as Krorainic or "Tocharian C", due to its relatedness to the two other Tocharian languages. It has been partially reconstructed from around 100 loanwords and over a thousand proper names used in these Prakrit documents that cannot be ascribed to Indic. In 2018, documents from Loulan written in Tocharian C were published, indicating a relationship to Tocharian A and B, but transcription of the texts in this study has been rejected by other scholars.