Not sure if you're still around, but yes you need stronger ventilation for Boro. It requires a hotter flame meaning bigger fire, and a LOT of the colors that come from boro require hitter flame which means off gassing is a much bigger concern. Colors in soft glass off gas a bunch also, but with a bigger, hotter, more intense flame, you're really pushing those minerals inside the glass to a higher temp causing much more off gassing.
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