What characterizes a loose base in eyelash extensions?

A loose base in eyelash extensions is characterized by a blunt end that fails to bond properly. In the context of eyelash extensions, achieving a secure bond is crucial for the durability and longevity of the extensions. When the base of the extension is blunt, it can create an insufficient surface area for the adhesive to adhere effectively to the natural lash. This leads to a weaker bond, resulting in the extension being more prone to lifting or falling off prematurely.

A firmly bonded extension will smoothly transition from the natural lash to the extension, allowing for a natural appearance and good retention. The bond formed should allow for natural lash growth without causing damage. If the extensions are improperly applied due to characteristics like a blunt end at the base, it compromises the entire extension's integrity, leading to potential issues.

In relation to the other options, a perfect bond with the natural lash indicates a secure and healthy attachment, while an extension that is too long could lead to stress on the natural lash but is not directly associated with the characteristic of a loose base. A flexible attachment style, while it may describe the application technique, does not inherently characterize the bond quality of the extension.