Bonfire glass - so given its name from glass that found its way into beach bonfires, or was even caught in explosions during the second world war. During WW2 the army had bases on Folkestone beach, and it is likely that a lot of the bonfire glass we find there is from this time.
Bonfire glass usually has a 'melted' quality, and are often chunky pieces of glass fused with other colours. If you hold a piece up to the light you will be able to see air bubbles inside it, which were created from the heat of the fire or explosion.
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