Yes Marco, most definitely, in fact it is usually necessary to repeat the procedure many times.
Here is what I wrote in my post of yesterday:-
"The suspension is brushed onto the blade, and then it is massaged with a pinching action until the blade becomes very sticky; more suspension is applied and the procedure is repeated time and time again until the desired colour is achieved. The blade is then rinsed with water, dried with a lint free cloth, and then dried in direct sunlight. Then the complete procedure is repeated again however many times required, until the blade is the correct colour."
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