Ammonium Dichromate

Ammonium dichromate is a bright orange-red crystalline solid with a potent chemical punch. Here's a breakdown of its key properties:

• Chemical formula: (NH4)2Cr2O7
• Crystal structure: Bright orange-red needles
• Oxidation: Strong oxidizing agent reacts readily (sometimes violently) with reducing agents.
• Solubility: Dissolves in water.

Important warnings:

• Carcinogen: Ammonium dichromate is a known carcinogen, meaning it can cause cancer.
• Fire hazard: Can ignite easily and decompose violently in closed containers.
• Toxic: Exposure can cause skin and respiratory irritation.

Historical uses (mostly replaced due to safety concerns):

• Photography: Early photographic processes.
• Textile industry: As a mordant for dyeing fabrics.
• Leather tanning: In the tanning process.
• Pyrotechnics: Ingredient in some fireworks (use has declined).
• Volcano demonstrations: Sometimes used to create a volcanic eruption effect (use discouraged due to safety risks).

Safer alternatives: Due to safety concerns, ammonium dichromate is being phased out of many applications. Less hazardous alternatives are preferred whenever possible.