Our perception of sound is directly related to the physical properties of sound waves (see Figure 3.7). One of the ï¬ rst things that we notice about a sound is how loud it is. Loudness is determined by the intensity, or amplitude, of a sound wave and is measured in units called decibels. Zero decibels represents the loudness of the softest sound that humans can hear, or the absolute threshold for hearing. As decibels increase, per-ceived loudness increases. Pitch refers to the relative âhighnessâ or âlownessâ of a sound. Pitch is determined by the frequency of a sound wave. Frequency refers to the rate of vibration, or number of waves per second, and is measured in units called hertz. Hertz simply refers to the num- ber of wave peaks per second.
Itching is a good sign as it means the skin is healing. The complete healing process for microbladed eyebrows typically takes six weeks and then a touch up appointment follows. The touch up appointment is scheduled during the initial microblading appointment for six to ten weeks later.
1 You may resume taking your vitamins 72 hours after. 2  If you have been on prescription Accutane in the past, you MUST wait at least one year before considering this procedure.  Anyone under the age of 18, at brows & blush co, you must be 18 years or older to receive the microblading service.