A 26 year old female patient complains of discoloration with her upper front teeth. Intra-oral examination reveals intrinsic staining with maxillary incisors. Dentist prepares the tooth to receive veneers. This type of margin design is called as:

The blending effect is predominantly related to smaller restorations, surrounded by hard dental tissues, such as composite restorations. It can reduce suboptimal shade matches due to operational error or lack of satisfactory match in the shade guide or restorative material. The veneers designed with “contact lens effect” margins before and after cementation are another example of blending effect. Ref: Sturdevant's art and science of operative dentistry. 4th edition page - 205