Strong - it could withstand Uri Geller!
I think I've found it. I bought an orange and a green set (I have a green and cream kitchen that permits odd touches of orange and pink.) The orange is a little paler than in the photo; not a bright orange but pleasing and subtle. I was a little wary of ordering green as I feared it might be the modish yellowy 'Chartreuse' I personally hate, but it's a proper retro leaf green.