Cobalt Chloride Paper (Container 100 sheets)

The paper operates on the reversible hydration of Cobalt(II) chloride

:

• Blue (Anhydrous): In dry conditions, the paper remains a deep sky blue.
• Purple (Dihydrate): As it begins to absorb moisture, it transition through a purplish mid-phase.
• Pink/White (Hexahydrate): When fully hydrated by direct liquid contact or high humidity (typically 50% RH or higher), it turns a distinct light pink or white.
• Reversibility: The paper can be "reset" to blue by heating it gently in a warm oven (around 50°C) or by using a hair dryer to drive off the water molecules. 

• Botanical Transpiration: Students often clip the paper to the upper and lower surfaces of a leaf to demonstrate that water vapour is primarily lost through the stomata on the underside.
• Humidity Monitoring: It is used to test the relative humidity in different parts of a classroom or inside sealed containers.
• Leak Detection: In physics and plumbing labs, strips are placed near joints to identify microscopic cracks or water intrusion patterns. 

• Keep Sealed: Because it is highly hygroscopic (moisture-absorbing), the container must remain tightly closed. Exposure to even 55% relative humidity is enough to cause a slow, unwanted color change.
• Use Forceps: Moisture from your skin can trigger a color change; always handle the sheets with forceps or tweezers.
• Safety: While used in schools, Cobalt(II) chloride is toxic if ingested. Students should wash their hands after use.

Spesification

• Pack Size: 100 pages
• Material: Paper
• Narrow Strips: Approximately 48mm x 6mm
• Product of India