Dilute CFR in ratio between 1 : 6 to 1 : 20 with water.
Soak absorbent stone thoroughly wit water beforehand. Apply the solution and allow to react for a short time, then rinse well with water. As a general principle, check whether the stone is suited for treatment with CFR by doing a patch-test with a dilution of CFR 1 : 6 with water. If the stone is sensitive to acid , an effervescing takes place. In such case it must be further diluted up to 1 : 20 and only a short reaction time should be allowed. Changes of color can occur on some ceramic tiles, even using a weak solution, without any effervescing. This may only be visible when the ceramic has completely dried. In this case treatment with is not recommended.
Soak absorbent stone thoroughly wit water beforehand. Apply the solution and allow to react for a short time, then rinse well with water. As a general principle, check whether the stone is suited for treatment with CFR by doing a patch-test with a dilution of CFR 1 : 6 with water. If the stone is sensitive to acid , an effervescing takes place. In such case it must be further diluted up to 1 : 20 and only a short reaction time should be allowed. Changes of color can occur on some ceramic tiles, even using a weak solution, without any effervescing. This may only be visible when the ceramic has completely dried. In this case treatment with is not recommended.
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