My son wants a black OP cake.  I found the molds for the guns and want to make

them out of choc. but I want to make them real like.

What can I paint on the choc. that is edible and does not change the taste and would I use white or brown choc.

Please help if you can, any advice will be very helpful.

Hi and Welcome to CC, shirley6. 

Some previous painting on chocolate threads:

http://cakecentral.com/t/718438/painting-chocolate

http://cakecentral.com/t/711218/question-about-painting-on-chocolate

http://cakecentral.com/t/753130/chocolates-moulds-applying-color-w-o-cocoa-butter

http://cakecentral.com/t/723583/can-i-paint-on-molded-chocolate

http://cakecentral.com/t/52978/painting-colors-in-chocolate-molds

How to mold chocolate:

http://www.candylandcrafts.com/chocolatecandymolding.htm

http://www.chocoley.com/chocolate-candy-making-guide/how-to-mold-chocolate.htm

http://candy.about.com/od/phototutorials/ss/How-To-Make-Molded-Chocolate-Candies.htm

http://www.happynews.com/living/chocolate/mold-chocolate-home.htm

http://www.ghirardelli.com/recipes-tips/working-ghirardelli/dipping-candymaking

http://www.chocolate-candy-mall.com/what-kind-of-chocolate-can-be-used-in-chocolate-candy-molds.html

Candy wafer melts:

http://www.wilton.com/store/site/product.cfm?sku=pg_candymelts

http://www.candylandcrafts.com/Merckens_Rainbow_Wafers.htm

Tempered chocolate & How to temper chocolate:

http://cakecentral.com/t/735406/tempered-chocolate

http://cakecentral.com/t/656813/question-about-tempered-chocolate

How to mix candy wafers and tempered chocolate:

(No tempering required.)

http://cakecentral.com/t/751605/best-chocolate-for-dipping/15

(See BlakesCakes post.)

HTH

P.S.  I retyped your post using both upper and lower case.  (Using all caps is considered "shouting".)

Thank you so much for the info. Plus not sure why it was in all caps first time my computer goes crazy at times 

You're welcome. 

Look forward to seeing pics of your creation.