Horatio Delbert Concentrates Horatio Delbert Concentrates HDC LHO is a light aromatic hydrocarbon extraction facility researching the development of renewable regenerative non polar green terpene solvents. Leave a Reply Cancel replyCommentEnter your name or username to comment Enter your email address to comment Enter your website URL (optional) Save my name, email, and website in this browser for the next time I comment. Δ