Kriab-mirror tesserae are a type of lead-coated mosaic mirror found in most archaeological
sites and antiquities dating back to the 18th century in central Thailand. The need for restoration
work has prompted the search for alternative mirrors with similar characteristics to the ancient
ones. Prototypes of alternative lead-coated mirrors were successfully used to restore a variety of
archaeological sites and artifacts, demonstrating their potential application in heritage conservation
and restoration work. We investigated the selected ancient Kriab samples in terms of their composition
in both glass and reflective coating layers, as well as the chemical and mechanical characterization
of the selected alternative Kriab mirrors. We employed a standard lab-shear test, which proved
difficult to evaluate due to failure not occurring between the glass-to-metal interfaces. However,
a modified lab-shear specimen setup was used to elucidate the peel-off bonding behavior of the
lead-to-glass interface. Additionally, we measured the L*, a*, and b* values in the CIE-Lab standard,
which exhibited variations for each colored Kriab mirror. The %reflectance of the selected ancient
and alternative Kriab mirrors was highly similar when lower than a high %reflectance of a standard
silvering mirror. Thai professional conservators have embraced the use of alternative Kriab mirrors
in restoration projects as a replacement for old Kriab mirrors, as they are more compatible in terms
of color and avoid the excessive brightness of silvered colored mirrors. However, the weathering
durability of the alternative mirrors was poor due to the leaching of alkaline and lead ions caused
by hydrolytic attack on the poor chemical stability separated phase. Overall, our research provides
valuable insights into the properties and qualities of both ancient and alternative Kriab mirrors,
which will be useful in the further development of mirrors with more resembling properties or even
more environmentally friendly Kriab mirrors and their potential applications in restoration work in
Thailand and archaeological sites in Asia.