How to retrofit do beautiful old ceramic tile seam? （ To clean up)

Q: how to retrofit do beautiful old ceramic tile seam?

a: old ceramic tile can be refurbished do beautiful seam, you first need to slit, good clear aperture can use a pen knife, shovel, difficult to clean up you need to use electric crack-cleaning cone to clean up. Especially ceramic tile edge mobile to clean, do not have a black seam. After the operation, you can use the seam an agent construction.