Through the X-BIS Screen, explosives are seen in

Through the X-BIS Screen, explosives are seen in

Orange colour
Green colour
Black colour
White colour
This question was previously asked in
UPSC CISF-AC-EXE – 2017
The correct answer is A) Orange colour. In most standard X-ray Baggage Inspection Systems (X-BIS), organic materials, which include explosives and narcotics, are typically displayed in shades of orange or brown.
– X-BIS machines use dual-energy X-rays to differentiate between materials based on their atomic number (Zeff).
– Different colours are assigned to different categories of materials:
– Organic materials (low Zeff, e.g., paper, cloth, food, explosives, drugs) – often shown as orange/brown.
– Mixed materials (medium Zeff, e.g., plastics, water) – often shown as green.
– Inorganic materials (high Zeff, e.g., metals, glass) – often shown as blue/black.
– This colour coding helps security personnel quickly identify potential threats or prohibited items within luggage. While colour schemes can vary slightly between manufacturers, the orange/brown representation for organic materials like explosives is widely used.