How to use room-temperature Multi-Etch
We recommend using your Multi-Etch heated because it’s MUCH faster — typically 7-15 seconds. When using it at room temperature, etching time will initially be 2+ MINUTES but will speed up the older the bath is. In a one-year old bath your etching time would be reduced to about one minute.
Your first order will come in a jug with the Multi-Etch powder at the bottom. This container can be used to dissolve and mix your Multi-Etch for your first and future orders. Store and use Multi-Etch in plastic containers, never in metal or glass.
Subsequent orders will come in a bag with just the Multi-Etch Powder. Because the ingredients are not blended, you must mix the entire package.
In order to use Multi-Etch at room temperature—70°F—the etch bath must be mixed double strength and heated one time. You can do this in a crock pot or a simple double boiler. Then the etchant can be used right away and at room temperature after it cools. When heating the Multi-Etch, use proper indoor ventilation or do it outdoors.
Simple double boilers are shown at right. Use plastics marked 5 or 7 for the container that holds the Multi-Etch.
Simple Double Boilers
Set up your double boiler near a fume hood or window, or heat outside. Put on your protective gear: safety goggles, gloves and a lab coat.
Mark the jug “double strength.” Prepare your Multi-Etch for use. With the help of a funnel, pour 1/2 gallon of distilled or deionized water into the jug. Shake vigorously and pour the entire 1/2 gallon into the inner container of the double boiler. Fill the outer container of the double boiler with tap water so that the water level is below the lip of the inner container.
If using a fume hood, turn it on.
Heat the Multi-Etch to 150°F; use a probe thermometer or, if unavailable, look for the tiny bubbles to appear and then continue heating for about ten minutes.
While waiting for the Multi-Etch solution to reach desired temperature, degrease your titanium parts with Simple Green.
Then rinse and submerge your titanium piece in the Multi-Etch bath for 10 seconds (if bath is still hot) or at least 2 minutes if cooled to room temperature. Rinse and anodize right away or store in distilled or de-ionized water to prevent re-formation of the natural oxide layer. If the color is not good enough, etch longer.
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