Hi im also studying The Laboratory. Here are some of the techniques Browning uses-
word chice- eg. "ensnared", "minion", "brave"
metaphor- "gold oozing", "devils-smithy"
Personification- "brave tree", "bite into its grave"
Alliteration- "brand, burn up, bite", "moisten and mash", "poison to poison thee, prithee"
use of exclamation marks- shows exitement, reinfources delight ,anger and agitation
use of questions- she is curionus, caught up in knowing, delight.
stucture and rhyming scheme
hope it helps and i haven't responded to late![Smile [:)]](/emoticons/emotion-1.gif)