Recommended Ratio for 8 Hours Fragrance Spray Base (Musk-Free) with Alcohol

Based on your formulation of 30% fragrance oil, the remaining 70% will be the solvent system consisting of 8 Hours Fragrance Spray Base (Musk-Free) and 99.9% alcohol.

The 8 Hours Fragrance Spray Base product description suggests using the base at a rate of 60-90% of the solvent system. This means that within your 70% solvent portion:

• The 8 Hours Fragrance Spray Base should make up 60% to 90% of this 70%.
• The 99.9% alcohol should make up the remaining 10% to 40% of this 70%.

This translates to a ratio of 8 Hours Fragrance Spray Base : 99.9% Alcohol ranging from 3:2 (60% Base : 40% Alcohol) up to 9:1 (90% Base : 10% Alcohol).

Since the product description mentions that adding alcohol can reduce the scent longevity benefit, it is generally recommended to use a higher proportion of the 8 Hours Fragrance Spray Base relative to the additional 99.9% alcohol. You could start with a ratio like 4:1 (80% Base : 20% Alcohol) or even 9:1 (90% Base : 10% Alcohol) within your 70% solvent blend for potentially better performance in terms of scent duration.

Mix the 8 Hours Fragrance Spray Base and 99.9% alcohol first according to your chosen ratio to create the 70% solvent blend, and then add your 30% fragrance oil to this blend.