The confirmation letter of American visa does not need to be printed in color. The confirmation letter of the US side when checking the visa mainly depends on the printed bar code. As long as the printed bar code is clearly visible and recognizable, it is ok. American visas are divided into immigrant visas and non-immigrant visas, and immigrant visas are divided into family visas, professional visas and special immigrant visas.

Extended data:

1, visas are usually endorsed on passports, some are endorsed on other travel documents instead of passports, and some are issued separately. For example, immigration visas in the United States and Canada are A4 paper, and Singapore also issues separate paper visas to foreigners. Generally speaking, a visa must be used at the same time as a passport to be valid.

Generally speaking, foreigners are granted different entry visas according to the identity of the applicant and the purpose of entry, such as visas for traveling, visiting relatives, emigrating, studying abroad and working, and the residence time after entry is limited. Due to the different types of visas, the relevant materials needed are also different. Generally, short-term residence applications have fewer restrictions and shorter waiting time for approval. For the purpose of long-term residence, the application is more restricted and the waiting time is longer.

Baidu encyclopedia-visa for going abroad