In general, if a sawblade has colourful paint on it, it is designed to be used until blunt and then thrown away and replaced. In some situations, particularly for site use, this type of blade is preferred to the full fat hand smithed industrial quality blades
Although the manufacturers would love you to believe otherwise, blades of this type are pretty much of a muchness. Atkinson Walker's professional trade rated (Pro Trade) range of sawblades are of comparable quality to the heavily marketed premium commercial brands, but a little easier on the pocket.
For a limited time only - use the code AWWH25 at the checkout to get 25% off Atkinson Walker Circular Saws.