WHAT DOES THE PRHASE MEAN WHEN SEEN IN A SHOP-WINDOW: "Sale From RM6 Onwards"?

Hi everybody! I can speak English and understand it quite well. But I was really puzzled by the phrase, which I saw in a shopping center, and the phrase is:

SALE FROM RM6 ONWARDS.

What could it possibly mean?

STIFF MARTINY and DRY MARTINY - ARE THESE EXPRESSIONS SYNONYMIC?

Hi, everybody!

Do the expressions DRY MARTINY and STIFF MARTINY mean the same?

Thanks in advance!

WHAT DOES "ROYAL MEMO" MEAN?

Hi all

From an article about prince Charles:
He​ has an enormous private staff— secretaries, deputy secretaries, press officers, four valets, two butlers, housekeepers, two chefs, two chauffeurs, ten gardeners, an army of porters, handymen, cleaners and maids. They are expected to get everything right. When HRH (His Royal Highness) feels they have performed their duties well, they are praised in a royal memo.

What does "praised in a royal memo" mean? "I do know that "memo" means "memorandum" - a written message. So,what does he do exactly when he "praise in a royal memo"? I can hardly imagine him just writing down something good about these people on a sheet of paper:) 

DEAR NATIVE SPEAKERS, HELP ME FIND THE PROPER VERB Hi, everybody! I need your help! I can't deside which verb to choose. The passage I'm working at is about a liquid which helps eliminating scratches from the surface of a car. After it has dried, it becomes the same colour as the colour of the car. So after using it it's not seen, - so, I should say: It TAKES? /GETS? /AQUIRES? --- the colour of the car. Which verb to use? Thanks in advance!

DEAR NATIVE SPEAKERS, HELP ME FIND THE PROPER VERB

Hi, everybody!

I need your help! I can't deside which verb to choose. The passage I'm working at is about a liquid which helps eliminating scratches from the surface of a car. The liquid itself is transparent, so after using it it's not seen, - so, I should say:

It TAKES?  /GETS?  /AQUIRES? --- the colour of the car.

Which verb to use?

Thanks in advance!