dissolve the fragrance and benzophenone-2 in the alcohol. cool the solution to 4 C and maintain at that temperature for 24 h. filter through a pressure filter at 4 C [e.g., through a balston pressure filter at ± 0.3 bar pressure unsing a standard garde A (0.9 ? filter tube)]. fill the filtered fragrance concentrate into suitable glass bottles, purge, swage the valve on and pressure fill with dimethyl ether.
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