| abstract |
In a honeycomb structure made of a honeycomb block including a plurality of honeycomb units joined to each other across a seal layer laid between adjacent ones and each of which is formed from a plurality of cells laid longitudinally side by side and cell walls each separating the adjacent cells from each other, or in a honeycomb structure made of a honeycomb monolith including a plurality of cells disposed longitudinally side by side and cell walls each separating the adjacent cells from each other and a seal layer provided over the outer surface of the honeycomb monolith, the seal layer has a color of 60 or more in CIE (1976) psychometric lightness (L*). |