When should I use a yellow screen printing mesh?
When you are doing fine detail is the short answer. Generally speaking there is very little difference in the performance of the mesh unless you are using 90T upwards. Yellow mesh absorbs more light and stops light scattering, this helps expose those very fine lines and intricate details. We use Italian mesh yellow and white, they are great for fine halftones with high resolution and has the greatest possible exposure latitude with unsurpassed protection against light-undercutting.
Getting the right mesh count is like getting the right squeegee and the right ink for the job in hand. These are ALL really important and make the difference to your finished product. Remember what you are trying to do is push the ink through the mesh on to the substrate. So the wrong mesh will result in too much or too little ink getting through. Not good. A very detailed design on a coarse mesh won’t work either.
Wicked Screen Printing Supplies Blog 
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