#125 - LASH DICTIONARY: Do You Know The Lash Lingo?

We've developed the Locks Lash Dictionary so you can come to one place to keep yourself up to date on all the Lash-Lingo.
Consider this your one-stop shop for all terminology we're using all the time in our industry. It's really important to be on top of the meaning of terms so that you can continue to be the very top of your game and stay educated!





A contraindication is a medical term which is a condition or a factor that serves as a reason to withhold a certain treatment. In relation to lash intentions, refers to a reason which would stop lash extension application from being performed.



Curing is a chemical process in which the adhesives crystallizes completely. The adhesive then attains its final properties and builds up its final strength. The characteristics of the adhesive also change through this process, literally forming 'a strong bond'.



This is the main ingredient in lash adhesives. It provides the glue with adhesive quality. Without cyanoacrylate, the extensions wouldn't adhere to the natural lashes. This ingredient is used in all eyelash adhesives.


Dry Time

Dry time is the recommended length of time between coats of product.

Cure Time

Cure time is the length of time recommended before subjecting your finished project to daily use.


Formaldehyde is formed as a by-product during the production process by the decomposition of other components in eyelash extension glue. It is a colourless, strong-smelling, chemical.

Volume Fan

A volume fan is simply several lash extensions joined together at the base, applied the same way as individual one-on-one lash extensions. The fans can be created by hand using one of many techniques or purchased pre-made.



A substance used to extend lash retention of extensions by cleansing the natural lashes, removing any makeup, dirt and oil for a longer lasting bond.

pH Levels

This is a measure of acidity, and in this case we mean how acidic (or not) the lash that the glue is getting attached to is. Pretty simply, if the lash is too acidic or not acidic enough the chemical reaction of the glue setting wont take place properly = worse retention. 


SOME USEFUL EXTRA READING! Click below for our blog on Bad Batches of Glue (or so you think):


Patch Test

A patch test is a diagnostic method used to determine which specific substances cause allergic inflammation of a patient's skin. Patch testing helps identify which substances may be causing a delayed-type allergic reaction in a patient, and may identify allergens not identified by blood testing or skin prick testing.



This is the amount of time the eyelash extension stays on the natural lash. 


Shock polymerisation

Simply put, Shock Polymerization occurs when your adhesive cures too fast. It happens as a result of too much moisture.


This is a measure of a fluid's resistance to flow. It describes the internal friction of a moving fluid. A fluid with large viscosity resists motion because its molecular makeup gives it a lot of internal friction. Honey is a good example of a liquid which has high viscosity.