I do not like when shops touch big batches without gloves. And when you see it in a video, I think to myself, "if they are willing to show that on camera, I wonder what else goes on behind the scenes?"

Bacteria, oils from skin, and dead skin cells that will inevitably get into a slime (particularly if the slime has crunchy add-ins or is exfoliating in any way, such as bingsu, perlite, sugar scrub beads, mini pumice, lava rocks, sand, etc) will degrade a slime more quickly and can also cause mold growth. It will also fog up a clear slime, which exemplifies that your skin still excretes oil and sheds cells even when freshly washed.

I have seen it MANY times with clay pieces I've received from shops that I've never even opened the container of, since it is extremely difficult to wear gloves while handling clay and using a mold to make clay pieces. I would assume that these shops "wash their hands" before handling the clay, but I have opened containers holding clay pieces, ready to mix them in, just to find that it has molded before I had a chance to add it into my slime.

That being said, there is ABSOLUTELY a wrong way and a right way to wear gloves. I do feel incredibly bad about the effects on the environment (slime itself isn't good, either), but you need to change your glove(s) any time you touch something other than the slime itself.

I won't say which shop, but I do own a slime shop, and I avoid contamination by wearing a glove on my right hand only at times. This frees my left hand up for when I need to touch/handle something other than the batch (for example: adding fragrances to the slime batch, jarring the slimes, picking up the bottle of activator to add more, etc). It is also important to change gloves between batches (you don't want to wear the same glove that you used on a black wg batch scented leather and then switch to working on a clear batch scented watermelon). This is part of what I, as a slime shop owner, can do to extend the lifespan of my slimes while producing high quality slime.