<Li> Nishiki - e (錦絵, "brocade pictures") - a method in which multiple blocks were used for separate portions of the image, allowing a number of colors to be utilized to achieve incredibly complex and detailed images; a separate block would be carved to apply only to the portion of the image designated for a single color . Registration marks called kentō (見当) were used to ensure correspondence between the application of each block . </Li> <P> Further developments followed from refinements of technique and trends in taste . For instance: </P> <Ul> <Li> Aizuri - e (藍 摺り 絵, "indigo printed pictures"), Murasaki - e (紫 絵, "purple pictures"), and other styles in which a single color would be used in addition to, or instead of, black ink . These are specialty techniques that grew in popularity in the nineteenth century, though a few examples can be seen earlier . </Li> </Ul> <Li> Aizuri - e (藍 摺り 絵, "indigo printed pictures"), Murasaki - e (紫 絵, "purple pictures"), and other styles in which a single color would be used in addition to, or instead of, black ink . These are specialty techniques that grew in popularity in the nineteenth century, though a few examples can be seen earlier . </Li>

When did the first color printer come out