You should use a ratio of 3-5% terpenes. You can go up to a maximum of 10% but it will taste quite harsh at that level. Above that and it will not really be vapeable anymore and will be too runny and very harsh.
So a single gram of shatter should have about 0.05ml or so of terpenes. You can view our selection of Terpenes here: https://weedlist.shop/product-category/terpenes/
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