Carbon free copy paper contains CF layer and CB layer with chromogenic agent. The developer and chromogenic agent will turn yellow when they are oxidized with oxygen in the air
The wheeled dry powder fire extinguisher is divided into sodium bicarbonate dry powder fire extinguisher and ammonium phosphate dry powder fire extinguisher.
*The service life is based on Sinova’s R&D Lab data. The actual life is decided by several factors such as operation level, raw material quality, formula composition etc.
Many parents know that drawing helps to develop their children's ability in all aspects, so if their kids are interested in drawing, they will prepare a lot of colored pencils for their kids, which is not necessary.