Silvertize Cloth Independent Testing

1/16/2019
The Silvertize Cloth is an exciting new cloth containing 10% silver that is supposed to kill 99.9% of bacteria, viruses, and fungiThe company claims that it kills germs whether the cloth is wet or dry. They say that it is great for hands, phones, electronics, and many other things. If you don't want to read all of this page, click here for the spoiler results summary. The cloth is made of cotton which the company says is critical for the production of the germ-killing silver ions within the cloth. They say that artificial fibers (like microfiber) don't produce silver ions as well. 

The Silvertize company asked me to test their cloths and sent me a few free cloths to test. Here is the packaging mine came in. The company has since updated their packaging. 




I tested the Silvertize cloth to see if it kills germs and how well it removes germs from surfaces. I did not test it on hands. Skin has so much natural bacteria that it is hard to see how much is removed. 

Does the Silvertize Cloth kill germs? 

I tested several cloths for the ability to kill germs, including the Norwex cloth, and the Silvertize cloth is the only one that appears like it might actually kill germs. You can see all of the results and the complete experiments on this page. Here is a brief summary.

I washed my entire kitchen floor with cloths, including the Silvertize cloth, and got the cloths very, very, dirty. Then, I blotted the dirty cloths on agar plates as the "before". 

Then I rinsed the cloths in warm 90°F water for 30 seconds and blotted them again. Next, I hung them up to dry for 24 hours. After 24 hours, I wet the cloths in tap water and blotted them onto agar plates again. The agar plates were incubated in my warm 90°F incubator for 48 hours. 

In case you are new to looking at agar plates, the whitish/yellowish dots on the plates are colonies (or piles) of millions of bacteria. Not all types of bacteria can grow on these agar plates. Viruses can NOT grow on these agar plates. Yeast, mold, and fungus CAN also grow on these plates. In general, the more colonies that grow on the plate, the more germs there were on the surface that was tested. However, a clean agar plate does not necessarily mean that no germs whatsoever were present on the surface because not everything can grow on an agar plate.  

Norwex Cloth Results

Silvertize Cloth Results
As you can see, a lot of bacteria died in the Silvertize Cloth compared to the other cloths. So, it does seem like the cloth might really be killing germs. Please note that when you are using the Silvertize cloth to wipe off phones and keyboards, it is not going to get as filthy as I got it for this experiment. The Silvertize cloth might have an even easier time killing germs when it isn't as saturated with dirt as it was in this experiment. 

Please read my "Which cleaning cloths kill germs" page if you want more details from this experiment. 

How well does the wet Silvertize Cloth wipe off germs?

In these experiments, I swabbed cell phones and a computer keyboard before and after wiping them for 30 seconds with a wet Silvertize cloth. I wet the cloth in warm 90°F tap water and thoroughly rung it out. Then I wiped the phone (or keyboard) off for 30 seconds. I did the best possible job.

Then I swabbed the phone all over (except for the edges that I was holding) and rubbed the swab onto an agar plate. The plates were incubated for 48 hours in my warm 90
°F incubator. 


RESULTS
              BEFORE                            AFTER


The wet Silvertize cloth did a great job removing germs from these items. I also tested how well the Silvertize cloth removed germs from a dirty section of my kitchen floor. I swabbed the floor before and after wiping with the Silvertize cloth. 



Again, the wet Silvertize cloth does a good job picking up dirt and germs. 

How well does a DRY Silvertize Cloth wipe off germs? 

The Silvertize company also claims that the cloth kills germs even when dry. For this experiment, I wiped the phones with a dry Silvertize cloth all over for 30 seconds. I swabbed the phones before and after and rubbed the swabs onto agar plates. The plates were incubated for 48 hours in my warm 90°F incubator. 

RESULTS

              BEFORE                           AFTER

It is hard to imagine that any dry cloth would clean as well as a wet cloth. So, I'm not surprised that the dry Silvertize cloth does not get the germs off phones as well as the wet cloth. The company advertises that the cloth still kills germs even when dry. I am not contradicting that claim. The cloth may still kill germs even when dry. However, my results show that the cloth is unlikely to get germs off a surface as well when it is dry compared to when it is wet. It may still kill whatever germs it did pick up when dry. 

Conclusion

The Silvertize Cloth does seem to have some germ-killing capabilities. It removes germs better when it is wet than when it is dry in my experiments. I did not determine how fast the Silvertize cloth kills germs. I may work more on those experiments in the future. I like the Silvertize cloth because I know it is safe for my electronics and won't scratch a screen. Since I have had the Silvertize cloths, I have been using a damp one to wipe off my phones and computers. I can't guarantee it will kill/remove every germ from the computer or phone, but I think it will do a good job. If you would like to purchase Silvertize cloths, you can do so here. If you would like to purchase ANYTHING from Amazon using this link, I will get a small percentage of the sale. I use that money for my experiments and would really appreciate your support. Thank you!--Annie Pryor