how is black wristband

Different color of the bracelet has different meanings.
Band color white stand for making poverty history.
Yellow stand for livestrong.
Black and white stand for standing up and speaking up.
Blue stand for beatting bullying.
Pink stand for supporting knowledge strength.
Blue and white stand for one world one cause
Blue and green stand for say no to sectarianism.
Also a silicone bracelet can be used as a promotional item for entertainment or sport. It is hot sale as a advertisement gift.
Most of the silione bracelets are of no meanings , people wear it just as a popular jewellery.
After proper dewatering , the silica gel mSiO2•nH2O become a porous mass that is of different particle size. This is so called the silicone.
The silicone has the open vesicular structure , large specific surface. So it can absorb many substances as a good desiccant, adsorbent and catalyst carrier.
Adsorption of the silicone is mainly the physical one that can be regenerated and good for repeated use.
Let the silica gel soak in the cobalt dichloride solution then get it dried and activated , will become the allochroic silica gel. It will transfer from blue to red color when absorb water. Changes in color shows the degree of water absorption and whether need the regeneration treatment.
wristband

wristband

wristband

wristband