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=== Relations With Metal ===
Once trapped in a gem, spren respond to stimuli in consistent and predictable ways. The metal frame surrounding the gem creates the stimuli the spren react to - pressing metal against a flamespren in a ruby increases and decreases heat.{{book ref|sa3|33}} Spren react to different metals in different ways. For example, [[zinc]] will cause the spren to more strongly manifest, while [[brass]] will cause it to withdraw and its power to dim. {{book ref|sa4|7}} This
=== Modification with aluminum ===
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