The July 7 terrorists left a trail of clues for police before setting off their bombs so that they would be instantly recognised as "martyrs", a court heard on Monday.
The bombers scattered identity and bank cards around the Tube carriages they targeted before placing their rucksacks on the floor and setting off the explosives inside them, jurors heard.
The details emerged for the first time as a forensics expert's evidence was read at the trial of three men accused of helping to plan the atrocity.
Jurors were told the "unique" bomb mixture was made up of black pepper and hydrogen peroxide, which was put into ordinary plastic bags alongside ice-packs to cool the volatile material.
The bombers were not wearing the rucksacks at the time of the explosions, but had instead put them down on the floor of the bus and Tube trains, it was claimed.
Neil Flewitt, QC, prosecuting, said that expert Clifford Todd had examined the wreckage of the bomb sites.
He said: "It is, in the opinion of Mr Todd, noteworthy that at each scene, some personal materials and documents, such as ID cards, were found relating to the bombers.
"Although they were damaged to some extent, they did not show the damage that would be expected if they were on the body of the bomber or in the rucksack, suggesting that in each case they had been deliberately separated by some distance from the actual explosion."
He said that Ali, 25, Saleem, 28, and Shakil, 32, visited a series of locations which bore a striking similarity to where the bombs were detonated on July 7, 2005.
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