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Stacking is a similar method to capping and multi lash pickup that adds volume to lashes. Like capping, it is the addition of extra lashes (usually finer/ lightweight) to give a more textured effect but differs in that the lashes are placed at an angle to splay out like a fan for added volume rather than added in parallel. You must make sure that the lashes you choose do not overload the natural lash. The chart below is a guide demonstrating what thicknesses you can safely substitute..
1 x 0.20 12mm (maximum weight you should apply to a lash)
= 1 x 0.15 + 0.10
= 2 x 0.12
= 3 x 0.10
= 6 x 0.07
This can vary depending on the length of the lashes. This is assuming all the lashes are the same length but if you are attaching shorter lashes=Less weight so you may be able to attach more.
The diagrams below show how you would create a fan effect using stacking with 3 x 0.10 lashes. This is alternative (and more time consuming!) method making of a 3D fan if you are not quite confident with volume lashing.
First you would apply your 0.10 to the natural lash and then attach another 0.10 on either side but approaching and bonding at an angle. You don't want too much adhesive on the lashes as it will take too long to bond and you will find that as it dries the lash will move into an undesired angle. Use a quick setting adhesive to ensure fast bonding and attach only at the base.
For lashes that aren't quite so strong you could do a 2D effect instead using 2 x 0.10s. Attaching the lashes either side instead of attaching one to the natural lash and then one off to the side can give you a more 3D effect as you will still be able to see the natural lash underneath.
If you want to create more of an outward sweep you could attach two lashes splaying out from one side of the natural lash. In this case the diagram would be the client's right eye as you are looking down on them. You would need to apply the lashes like this only from the middle to outer corner to get more of a sweep effect.
If you want to create a 3D effect but you don't feel like your client could support 3 x 0.10 you can bond a single 0.10 or 0.12 and then cap either side in a 0.07. You will get the effect without adding too much weight to the lash
You can also use stacking to give the eye a wider appearance. This would be useful if your client's eyes weren't even and you wanted to make one look wider than it is.
The diagram shows your first lash (pink) bonded to the natural lash as usual, following the direction of the lashes but with another lash stacked to one side (green).You would apply the stacked lash on the right hand side on the right half of the eye and the left hand side on the left half.
This will draw the eye outwards to give the appearance of it being wider than it actually is. You could make it appear even wider by applying longer lashes on the outer corner of this eye if there was a drastic difference in eye width.
Here I have double stacked a 0.15 with 2 x 0.10 just to illustrate. On the two lashes on each corner I have stacked both 0.10s on one side to draw the eye outwards but on the centre lashes they are more balanced with one 0.10 on each side.